$1.$ Project XX has the cash flows of $-$$$800,1,900,2,200,$ and $-3,800.$

a$.$ Calculate XX$$s Net Present Value $($NPV$)$ at discount rates $($WACC$)$ of $0\%,8\%,15\mathrm{.}5729\%,27\%,126\mathrm{.}78\%,$ and $150\%.$

b$.$ What are XX$$s IRRs?

c$.$ If the cost of capital were $10\%,$ should the project be accepted or rejected?

$2.$ Project K has a cost of $$1,500$ and cash flows of $$700$ per year for $3$ years plus another $$1,200$ in Year $4.$ The project$$s cost of capital is $13\%.$

a$.$ What are K$$s regular and discounted paybacks?

b$.$ Would the project be accepted if the company requires a payback of $3$ years or less?

c$.$ Would this be a good accept$/$reject decision, considering the NPV and$/$or the IRR?