Use notation table maybe?

20. For the following cash flow, compute rate of return. Year 0 1 2 3 4 5 | Cashflow($) | -140| 20| 30| 40| 50[ 60| a. 8% b. 11% c. 14% d 17% 21. All of the following cash flows should be identified as benefits, except: a. Longer tire life because of smooth pavement b. Expenditure of $10 million for construction of a highway . 52 million annual income to local businesses because of tourism created by a water reservoir d. Fewer highway accidents because of improved lighting 22. Assume below alternative has a 5-year useful life and no salvage value. The minimum attractive rate of return is 6%. Should the engineer accept this alternative? Alternative Initial Cost ($) 400 Uniform Annual Benefit ($) 100.9 . Accept b. Reject