Average rate of return$-$new product

Oahu Inc. is considering an investment in new equipment that will be used to manufacture a smartphone. The phone is expected to generate additional annual sales of $3,600$ units at $$218$ per unit. The equipment has a cost of $$401,800,$ residual value of $$30,200,$ and an $8-$year life. The equipment can only be used to manufacture the phone. The cost to manufacture the phone follows:

$\backslash$table$[[$Cost per unit:,$],[$Direct labor,$$36\mathrm{.}00$