13. Woe and Grief, CPA's are considering the purchase of a new office computer that costs $20,000 and will provide the following net cash inflows: Annual Net Year Cash Inflow 1 $2,000 2 3,000 3 5,000 4 5,000 5 10,000 What is the payback period? (Cash is earned evenly throughout the year.) a. 4 years b. 4.5 years c. 5 years d. Cannot be computed.