can someone explain to me how this is 22?

Joetz Corporation has gathered the following data on a proposed investment project (Ignore income taxes.): $36,000 $ 8,400 Investment required in equipment Annual cash inflows Salvage value of equipment Life of the investment Required rate of return 15 years 108 The company uses straight-line depreciation on all equipment. Assume cash flows occur uniformly throughout a year except for the initial Investment Click here to view Exhibit 138-1 and Exhibit 13B-2. to determine the appropriate discount factor(s) using the tables provided. The internal rate of return of the investment is closest to: Multiple Choice 22