An electric cooperative is considering the use of a concrete electric pole in the expansion of its power distribution lines. A concrete pole costs Php 18,000.00 each and will last 20 years. The company is presently using creosoted wooden poles which cost Php 12,000.00 per pole and will last 10 years. If money is worth 12%, which pole should be used? Assume annual taxes amount to 1% of first cost and zero salvage value in both cases.

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Littrell's Nursery needs a new irrigation system. System one will cost $145,000, have annual maintenance costs of $10,000, and need an overhaul at the end of year six costing $30,000. System two will have first year maintenance costs of $5,000 with increases of $500 each year thereafter. System two would not require an overhaul. Both systems will have no salvage value after 12 years. If Littrell's cost of capital is 4%, using annual worth analysis determine the maximum Littrell's should be willing to pay for system two.

A sportswear factory has two alternative machines for producing jerseys. Costs are shown below. Minimum acceptable rate of return is 8%.What is the annual cost for machine Y?