1. One of the two pumps will be selected to treat acidic water in industry. The first cost of the brass pump is 35,000 $ and its useful life is 8 years. When the brass pump is used for 7.000 hours, it requires a maintenance cost of 4,500 $ . On the other hand, the first cost of the stainless steel pump is 22,000 $, its useful life is 5 years and it requires 4,000 $. of maintenance cost when used 5.000 hours. Using a 15% interest rate, determine which pump would you buy if pumps were used for 340 days (8,160 hours) a year