Determine the IRR on the following projects:

a. An initial outlay of \($12,000\) resulting in a free cash flow of \($2,041\) at the end of each year for the next 11 years

b. An initial outlay of \($12,000\) resulting in a free cash flow of \($2,310\) at the end of each year for the next 19 years

c. An initial outlay of \($12,000\) resulting in a free cash flow of \($1,320\) at the end of each year for the next 12 years

d. An initial outlay of \($12,000\) resulting in a free cash flow of \($3,143\) at the end of each year for the next 6 years