Final answer:
To determine the expected average rate of return for each project, subtract the residual value from the estimated total income, divide by the investment amount, and divide by the useful life of the project. Project A's expected average rate of return is 7.97% and Project Z's is 7.6%.
Step-by-step explanation:
The expected average rate of return for each project is calculated by dividing the estimated total income over the useful life of the investment, minus the residual value, by the amount of the original investment. Then, that result is divided by the useful life of the project to determine the average annual return, which is then expressed as a percentage of the original investment.
For Project A, the calculation would be (($57,600 - $5,000) / $55,000) / 12 years = ([$52,600 / $55,000] / 12) ≈ 0.0797 or 7.97% average annual rate of return.
For Project Z, the calculation would be (($63,000 - $6,000) / $50,000) / 15 years = ([$57,000 / $50,000] / 15) ≈ 0.076 or 7.6% average annual rate of return.