An old, heavily used warehouse currently has an incandescent lighting system. The lights run essentially 24 hr/day, 365 days/yr and draw about 10 kW of power. Consideration is being given to replacing these lights with fluorescent lights to save on electricity. It is estimated that the same level of lighting can be achieved with 4.5 kW of fluorescent lights. Replacement of the lights will cost about $11,000. Bulb replacement and other maintenance are not expected to be significantly different. Electricity for the lights currently costs $0.045/kWh. The warehouse is scheduled for demolition in five years to make way for a more modern facility. The company has a MARR of 15%. Should the company replace the incandescent lights with fluorescent lights? State any assumptions you make. (6.4)
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Engineering Economy (17th Edition)
- For a motor to operate a pump, a design engineer must choose the horsepower. Horsepower rating is a design characteristic that can vary from 10 to 40 horsepower. The motor will cost $120 per year to operate, plus $0.60 per horsepower. The running expenses of such motors will be $0.055 per horsepower-hour divided by the horsepower rating. Each year, 9,000 horsepower-hours will be required. Determine how much horsepower should be supplied to keep the overall yearly cost to a minimal. Demonstrate that your entire cost each year has been reduced.arrow_forwardCurrent Attempt in Progress Mandy is considering investing in an opportunity that would require an upfront cost of $ 520 but would pay $ 150 per year for each of the next 6 years. If Mandy chooses to invest in this opportunity, what would be the IRR? Click here to access the TVM Factor Table calculator. Carry all interim calculations to 5 decimal places and then round your final answer to 1 decimal place. The tolerance is ±0.5. Should Mandy invest in this opportunity if her personal MARR is 20%?arrow_forwardNissan is advertising a 24-month lease on the all-electric Leaf for $190 payable at the beginning of each month. The lease requires a $2000 down payment plus the first months payment on signing. No security deposit is required. The lessee pays for maintenance, excess wear and tear, and $0.18 per mile over 12,000 miles per year. Lease end purchase option is $17500 and lease payments total $4560. A disposition fee of $350 is due at the end of the lease period. Assuming an interest rate of 6% compounded monthly, what is the total cost of leasing if you put 40,000 miles at the end of lease?arrow_forward
- An integrated, combined cycle power plant produces 285 MW of electricity by gasifying coal. The capital investment for the plant is $450 million, spread evenly over two years. The operating life of the plant is expected to be 18 years. Additionally, the plant will operate at full capacity 76% of the time (downtime is 24% of any given year). The MARR is 10% per year. a. If this plant will make a profit of two cents per kilowatt-hour of electricity sold to the power grid, what is the simple payback period of the plant? Is it a low-risk venture? b. What is the IRR for the plant? Is it profitable? a. The simple payback period of the plant is years. (Round up to one decimal place.) It's a venture. b. The IRR for the plant is%. (Round to one decimal place.) The plant isarrow_forwardA machine cost $315,000 to purchase. Fuel, oil, grease, and minor maintenance are estimated to cost $53.50 per operating hour. A set of tires cost $16,000 to replace, and their estimated life is 3,100 use hours. A $17,000 major repair will probably be required after 6,200 hr of use. The machine is expected to last for 9,300 hr, after which it will be sold at a price (salvage value) equal to 13% of the original purchase price. A final set of new tires will not be purchased before the sale. How much should the owner of the machine charge per hour of use, if it is expected that the machine will operate 3,100 hr per year? The company's cost-of-capital rate is 7.25%.arrow_forwardOregon Ducks, Inc. is considering buying licenses for 12 megahertz of wireless spectrum in the 700 MHz range, which is suitable for delivering television to mobile phones. The 700 MHz signals can travel long distances and more easily penetrate walls and other obstacles. The acquisition cost is $300 million. In addition, because networks that operate in the 700 MHz range are less expensive to build than those in other portions of the spectrum, Ducks estimates annual costs of $24 million over the next 9 years and no salvage value. During the same period, the company expects to generate annual revenue of $40 million by offering television and video to mobile-phone users. Calculate the net present worth of this investment if the company's minimum attractive rate of return (discount rate) is 13% per year.arrow_forward
- Brawdy Plastics, Inc., produces plastic seat belt retainers for General Motors at their plant in Buffalo, New York. After final assembly and painting, the parts are placed on a conveyor belt that moves the parts past a final inspection station. How fast the parts move past the final inspection station depends upon the line speed of the conveyor belt (feet per minute). Although faster line speeds are desirable, management is concerned that increasing the line speed too much may not provide enough time for inspectors to identify which parts are actually defective. To test this theory, Brawdy Plastics conducted an experiment in which the same batch of parts, with a known number of defective parts, was inspected using a variety of line speeds. The following data were collected. Excel file: data14-05.xlsx Number of Line Defective Speed Parts Found 20 23 20 21 30 19 30 16 40 15 40 17 50 14 50 11 If required onterarrow_forwardA diesel engine uses type A filter and high end lubricating oil costing $5.50 per liter. With this filter the oil and filter have to be change every 500 hours of operation, and 5 liters of oil have to be added every 100 hours. This filter costs $148 per piece. 80 liters of oil fill the engine. Another type, Filter B, costing $120 may be used with a lower grade of oil costing $4.80 per liter. However if this filter is used, the oil and the filter had to be change every 300 hrs and 10 liters are added after each 150 hrs the engine is used. Which type of filter would you recommend?arrow_forwardAn integrated, combined cycle power plant produces 295 MW of electricity by gasifying coal. The capital investment for the plant is $450 million, spread evenly over two years. The operating life of the plant is expected to be 15 years. Additionally, the plant will operate at full capacity 72% of the time (downtime is 28% of any given year). The MARR is 8% per year. a. If this plant will make a profit of two cents per kilowatt-hour of electricity sold to the power grid, what is the simple payback period of the plant? Is it a low-risk venture? b. What is the IRR for the plant? Is it profitable? a. The simple payback period of the plant is 12.1 years. (Round up to one decimal place.) It's a high-risk venture. b. The IRR for the plant is %. (Round to one decimal place.)arrow_forward
- Suppose that you have just completed the mechanical design of a high-speed automated palletizer that has an investment cost of $3,800,000. The existing palletizer is quite old and has no salvage value. The market value for the new palletizer is estimated to be $430,000 after nine years. One million pallets will be handled by the palletizer each year during the nine-year expected project life. What net savings per pallet (i.e., total savings less expenses) will have to be generated by the palletizer to justify this purchase in view of a MARR of 18% per year? Use the AW method. Click the icon to view the interest and annuity table for discrete compounding when the MARR is 18% per year. The net savings required to be generated by the new palletizer to justify its purchase are $ per pallet (Round to the nearest cent)arrow_forwardAn integrated, combined cycle power plant produces 285 MW of electricity by gasifying coal. The capital investment for the plant is $530 million, spread evenly over two years. The operating life of the plant is expected to be 18 years. Additionally, the plant will operate at full capacity 76% of the time (downtime is 24% of any given year). The MARR is 7% per year. a. If this plant will make a profit of two cents per kilowatt-hour of electricity sold to the power grid, what is the simple payback period of the plant? Is it a low-risk venture? b. What is the IRR for the plant? Is it profitable? a. The simple payback period of the plant is 14 years. (Round up to one decimal place.) It's a high-risk venture. b. The IRR for the plant is %. (Round to one decimal place.) CHEarrow_forwardAn integrated, combined cycle power plant produces 285 MW of electricity by gasifying coal. The capital investment for the plant is $700 million, spread evenly over two years. The operating life of the plant is expected to be 15 years. Additionally, the plant will operate at full capacity 77% of the time (downtime is 23% of any given year). The MARR is 7% per year. a. If this plant will make a profit of three cents per kilowatt-hour of electricity sold to the power grid, what is the simple payback period of the plant?.arrow_forward
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