At the beginning of $2015,$ a business enterprise is trying to decide between two potential investments.

Assuming a required rate of return of $10\%$ p$.$a$.,$ calculate the following for the investment proposals under:

$($a$)$ Return on investment

$($b$)$ Payback period

Include the formulas and show your work for each part. Refer to the rubric for detailed evaluation.

The forecast details are as follows:

$\backslash$table$[[,$Proposal A$,$Proposal B$],[$Cost of Investment,$$20,000,28,000],[$Life$,4$ years,$5$ years$],[$Scrap Value,Nil,Nil$]]$