A city engineer must choose between two different routes for a new sewer line. Route 1 is a 20,000-foot gravity line, which includes 8000 feet of tunneling at $250 per foot. The remaining 12,000 feet will cost $80 per foot. The annual maintenance cost is expected to be $2000. Route 2 is a 23,000-foot line requiring a pumping station, which will cost $840K to build and $15K annually to operate and maintain. The sewer line costs $80 per foot and will cost $2100 annually to maintain. The expected life of the station and both lines is 35 years. Using an interest rate of 8%, which route should be chosen using:

Emerson Electric is considering the purchase of equipment that will allow the company to manufacture a new line of wireless devices for home appliance control. The first cost will be $80,000 and the life estimated is 6 years with a salvage value of $10,000. Three different salespeople have provided estimates regarding the added revenue the equipment will generate. Salespersons 1,2, and 3 have made estimates of $10,000 , $16,000 , and $18,000 per year respectively if the Companys MARR is 8% per year find the PW of each salespersons estimates.

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A flood control reservoir project and channel improvement project are proposed for reducing flood damages along a stream in an urban area. Estimated costs are as follows: Dam and reservoir project Channel improvement project Initial investment $1,500,000 $1,200,000 Annual maintenance $10,000/yr $5,000/yr Hydrologic, hydraulic and economic studies have been conducted to develop the following relationships for the river reach and flood plain: (a) annual exceedance probability versus peak discharge with and without the reservoir, (b) discharge versus stage with and without the channel improvement, and (c) stage versus damage Annual Peak discharge Stage (ft) exceedance (cfs) probability Without With Discharge reservoir reservoir (cfs) Without With Stage Damage project project (ft) million) 0.50 3,000 2,700 0 0 0 9 0.0 0.20 5,400 0.10 7,600 4,200 3,500 5,000 10. 7 10 0.2 10,000 15° 11 15 1.1 0.05 10,400 5,500 15,000 20 14 20 2.2 0.02 0.01 19,000 0.005 24,000 20,000 15,000 8,600 20,000 23 17…