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15. If a project has an initial investment of $20,000, for 9 years a monthly interest rate equal to 1%, annual income starting at $50,000 and increasing annually by $4,000 for the next 5 years and remaining constant at $70,000 for the rest of the project's duration. On the other hand, there are estimated annual expenses of $40,000 constant over the duration of the project. What is the value of the internal rate of return? 0 174.2% 0 71.7% 0 171.7% C) 74.2%