For the net cash flow series, find the external rate of return (EROR) using the MIRR method with an investment rate of 25% per year and a borrowing rate of 11% per year Year 1 4 Net Cash Flow. $ 4,000 -5,000 -3,000 6,000 5 -800 The external rate of return is 29.74 % external rate of return (EROR) using the MIRR method with an investment rate of 25% per year 2 -5,000 3 -3,000 4 6.000 5 -800 6 3,400 4.000