Problem 12-13 Home Security Systems is analyzing the purchase of manufacturing equipment that will cost $60,000. The annual cash inflows for the next three years will be: Year Cash Flow 1 $ 35,000 | 2 25,000 3 21,000 Calculate your final answer using the financial calculator method (Excel). a. Determine the internal rate of return lasing interpolation. (Do not round intermediate calculations. Enter your answer as a percent rounded to 2 decimal places.) b. With a cost of capital of 18 percent, should the equipment be purchased