Warren Corporation is evaluating a proposal to invest in a machine costing $65,000. The machine has an estimated useful life of five years, and an estimated salvage value of $10,000. The machine will increase the company's net income by approximately $5,250 per year. All revenue and expenses other than depreciation will be received and paid in cash. (ii). The expected rate of return on average investment of the machine is approximately: Select one: a. 14.0% b. 18.6% c. 10.6% d. 6.6%