$9-20$ Compute the

$($a$)$ net present value,

$($b$)$ internal rate of return $($IRR$),$ and

$($c$)$ discounted payback period $($DPB$)$ for each of the following projects.

The firm's required rate of return is $14$ percent.Which project$($s$)$ should be purchased if they are independent? Which project$($s$)$

should be purchased if they are mutually exclusive? $($LO $9-2,$ LO $9-3,$ & LO $9-5)$