The payback period is 4.06 years.
Payback calculates the amount of time it takes to recover the amount invested in a project from it cumulative cash flows
Amount recovered in the first year = 46,700 - 10,000 = 36,700
Number of years it would take to recover 36,700 = 1 + (36700 / 12,000) = 4.06 years
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