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21-17 Capital budgeting methods, no income taxes. (LO 1, 2) Lethbridge Company runs hardware stores in Alberta. Lethbridge's management estimates that if it invests $180,000 in a new computer system, it can save $60,000 in annual cash operating costs. The system has an expected useful life of five years and no terminal disposal value. The required rate of return is 12%. Ignore income tax issues in your answers. Assume all cash flows occur at year-end except for initial investment amounts. Required 1. Calculate the following for the new computer system: a. NPV b. Payback period c. IRR