?(IRR calculation?) Determine to the nearest percent the IRR on the following? projects:

a. An initial outlay of ?$9,000 resulting in a free cash flow of ?$3,000 at the end of year? 1, ?$6 ,000 at the end of year? 2, and $8,500 at the end of year 3

b. An initial outlay of ?$9,000 resulting in a free cash flow of ?$8,500 at the end of year? 1, ?$6,000 at the end of year? 2, and $ 3,000 at the end of year 3

c. An initial outlay of ?$9,000 resulting in a free cash flow of ?$3,000 at the end of years 1 through 5 and ?$6,000 at the end of year 6