Answer:
3 years and 4 months
Step-by-step explanation:
Colby payback period = Investment in book and store / Annual cash income = $400,000 / $120,000 = 3.33 years = 3 years and (0.33 *12) months = 3 years and 4 months.
Therefore, the payback period for Colby is 3 years and 4 months.