30. Determine the average rate of return for a project that is estimated to yield total income of $699,840 over six years, has a cost of $777,600, and has a $86,400 residual value. Round to the nearest whole number. %

31. A project has estimated annual net cash flows of $23,000. It is estimated to cost $135,700.

Determine the cash payback period. If required, round your answer to one decimal place. ______ years