Rook, Incorporated, has the following mutually exclusive projects. a$-1.$ Calculate the payback period for each project. Note: Do not round intermediate calculations and round your answers to $3$ decimal places, e$.$g$.,32\mathrm{.}161.\backslash (\backslash$mathbf$\{$a $-2\}\backslash ).$ If the company's payback period is two years, which, if either, of these projects should be chosen? Project A Project B Both projects Neither project b$-1.$ What is the NPV for each project if the appropriate discount rate is $15$ percent? Note: A negative answer should be indicated by a minus sign. Do not round intermediate calculations and round your answers to $\backslash (\backslash$mathbf$\{2\}\backslash )$ decimal places, e$.$g$.,32\mathrm{.}16.$ b$-2.$ Which, if either, of these projects should be chosen if the appropriate discount rate is $15$ percent?

Project A

Project B

Both projects

Neither project