Year Cash Flow

$0$$$7,000$

$14,000$

$24,300$

$34,800$

a$.$ What is the profitability index for the cash flows if the relevant discount rate is $11$ percent?

b$.$ What is the profitability index for the cash flows if the relevant discount rate is $18$ percent?

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