36. Internal Rate of Return Analysis a. Based on the calculations below using the tables in the textbook, the internal rate of return (IRR) is between the following percentages: (The percentages given here must be as close as you can get within the constraints of the textbook tables.) Internal Rate of Return Analysis. Heston Farming Company would like to purchase a harvesting machine for $100,000. The machine is expected to have a life of 4 years and a salvage value of $20,000. Annual maintenance costs will total $28,000. Annual savings are predicted to be $60,000. The company's required rate of return is 11 percent (these are the same data as the previous exercise). Required: a. Use trial and error to approximate the internal rate of return for this investment proposal. b. Should the company purchase the harvesting machine? Explain