Year Cash Flow

$0$$ $7,000$

$14,400$

$24,600$

$35,800$

a$.$ What is the profitability index for the cash flows if the relevant discount rate is $6$ percent?

b$.$ What is the profitability index for the cash flows if the relevant discount rate is $14$ percent?

c$.$ What is the profitability index for the cash flows if the relevant discount rate is $26$ percent?