The Martian Corporation, a space vehicle development company, is starting a new division that will develop the next-generation launch missile engine configuration. Use a hand application of the MIRR method to determine the EROR for the estimated net cash flows (in exist1000 units) of exist-54,000 in year 0, exist15,000 in years 1 through 7, and exist-8,000 in year 8. Assume a borrowing rate of 15% and an investment rate of 29% per year. The external rate of return is %