Computing internal rate of return. Carlo Company is considering acquiring a machine that costs $40,000 and that promises to save $8,000 in cash outlays per year, after taxes, at the end of each of the next 12 years. Carlo expects the new machine to have no salvage value at the end of its useful life.

a. Compute the internal rate of return for this project.

b. Compute the internal rate of return, assuming that the cash savings were to last only 6. instead of 12.

years.

c. Compute the internal rate of return, assuming that the cash savings were to last 20.

rather than 12. years.

d. Compute the internal rate of return, assuming that the cash savings would be S6.000 rather than S8.000 per year for 12 years.