Please show all your work $to$ receive full credit.

$1-$You have three projects your firm $is$ considering:

$a.$ What $is$ the payback period $on$ each $of$ the above projects? $(1$ Point$)$

$b.$ Given that you wish $to$ use the payback method with a cutoff period $of$ two years, which projects would you accept? $(0\mathrm{.}5$ Points$)$

$c.If$ you use a cutoff period $of$ three years, which projects would you accept? $(0\mathrm{.}5$ Points$)$

$d.If$ the opportunity cost $of$ capital $is10\%,$ which projects have positive $NPVs?(2$ Points$)$