A solar energy research center requires specialized research equipment. For this purpose, four pieces of equipment and their associated cash flows (listed below) are under consideration. One piece of equipment must be selected and the laboratory's MARR is 10% per year.

a. Use the PW method to rank-order the economic attractiveness of the four pieces of equipment.
b. Determine the interest rate at which the laboratory would be indifferent between Equipments 2 and 3.

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Equipment EOY 0 -$150,000 -$80,000 -$125,000100,000 1-3$20,000 -$30,000 -$25,000$40,000 4 $30,000 $30,000 $25,000 $45,000 5 $40,000 $35,000$30,000 50,000