Can you solve this please and show me the steps.

P$10-3$ Choosing bretween two projects with acceptakle pyphack periods Shell Camping Gear Inc. is conabiering two mbitually exchative peopecta. Each requires an initial inveriterent $($CF$.)$ of $$100,000.$ Joha Shell, president of the oompeng, has set a maximum payback period of $4$ years. The after$-$tax cash inflows assecialed wath asch propect are shown in the following table.

$\backslash$table$[[$Year$,$Conh infores $[$CF$]],[$Projeeta$,$Prajeet $8],[1,$$$50\mathrm{.}000,540,000],[7,20000,30,900],[3,30\mathrm{.}000,20\mathrm{.}000],[4,40\mathrm{.}000,10,000],[5,20\mathrm{.}000,20\mathrm{.}000]]$

a$.$ Determine the payback period of each peopect.

b$.$ Because they are mulually exclusive, Sall math ahoser ene. Wharh should the eempany invelt in$?$

$6.$ Explain why eese of the propects is a lutser ahowe than the ether.