I got 20.0% but it's marked as incorrect.

For the net cash flow series, find the external rate of return ( EROR ) using the MIRR method with an investment rate of 167. per year and a borrowing rate of 117. per year Year net cash Flow 4, 000 - 3,000 - 4,000 3,000 -1, 300 4, 500 The external rate of return is 0%