Answer: 1.67 years
Step-by-step explanation:
Pay back period calculates the amount of years the cumulative cash flows from an investment equals the amount of money invested.
The table attached explains how the payback was calculated.
The $3600 cost of the cart would be recouped between the first and second years. Therefore, it would be calculated as 1 year + $2400 / $3600 = 1.67 years
I hope my answer helps you.