An irrigation system is to be installed for a public golf course. Each of three alternativ...

An irrigation system is to be installed for a public golf course. Each of three alternative designs consists of pipes and a pump. The piping system is expected to last 30 years, with zero salvage value. The pump is expected to last 10 years and have zero salvage value. Replacement pumps of the same design and cost will be used to extend the operation to 30 years. Cost estimates for the three alternative system designs are provided below.

The optimum alternative depends on the amount of water pumped each year to irri­gate the golf course. Determine the range in the amount of water pumped for which each alternative would be economically optimum based on a discount rate of 8 percent.