Answer:
b. 6 years.
Explanation:
The cash payback period is the length of time it takes for the future cash flows to equal the amount invested in a project.
where, Amount Invested = Sum of Cash flows
therefore,
$132000 = $22000 + $22000 + $22000+ $22000 + $22000 + $22000
thus,
It takes 6 years for cashflows to equal $132000.