Answer:
a. Net Present Value of Cool:
= Present value of cash inflows - Initial investment
= ∑(Cash flows * Present value factor) - Initial investment
= (38,000 * 0.893) + (43,000 * 0.797) + (48,000 * 0.712) - 97,000
= 102,381 - 97,000
= $5,381
Net Present value of Hot.
Cashflows are constant so this is an annuity:
= Cashflow * Present value interest factor of annuity - Initial investment
= 42,000 * 2.402 - 97,000
= 100,884 - 97,000
= $3,884
b. Profitability index for Cool:
= Present value of inflows / Initial investment
= 102,381 / 97,000
= 1.06
Profitability index for Hot:
= 100,884 / 97,000
= 1.04
c. Project Cool should be selected because it has a higher Net Present Value.