cannot use excel to solve

A firm with a 13.5 percent cost of capital is considering a project for this year's capital budget. The project's expected after-tax. cash flows are as follows. Year Cash flow. 0 $8,000 $2,900 $2,500 $3,900 Calculate the project's discounted pay back period. Selected Answer: oc, 3.43 years Answers: a. 3.57 yean b. 3.50 years c. 3.43 ytars d. 4,00 yearn e. 3.00 yearn