[Use Excel and include in the Excel file. For part (b) make sure that you include a snapshot of the Goal Seek function with correct usage for the question (before and after snapshots).] The Martian Corporation, a space vehicle development company, is starting a new division that will develop the next generation launch missile engine configuration. The related net cash flows over the years are given below. Assume that the borrowing rate is in = 12% and investment rate is 1 = 25% per year. Year CF (x 1,000 $) -50,000 15,000 15,000 15,000 15,000 15,000 15,000 -8.000 (a) [5 points) Use Excel built-in function MIRR to calculate the external rate of return. For which MARR values should the company develop the next generation launch missile engine configuration? (b) (15 points) Calculate the external rate of return ROIC (return on invested capital). For which MARR values should the company develop the next generation launch missile engine configuration? [Use Excel and include in the Excel file. For part (b) make sure that you include a snapshot of the Goal Seek function with correct usage for the question (before and after snapshots).] The Martian Corporation, a space vehicle development company, is starting a new division that will develop the next generation launch missile engine configuration. The related net cash flows over the years are given below. Assume that the borrowing rate is in = 12% and investment rate is 1 = 25% per year. Year CF (x 1,000 $) -50,000 15,000 15,000 15,000 15,000 15,000 15,000 -8.000 (a) [5 points) Use Excel built-in function MIRR to calculate the external rate of return. For which MARR values should the company develop the next generation launch missile engine configuration? (b) (15 points) Calculate the external rate of return ROIC (return on invested capital). For which MARR values should the company develop the next generation launch missile engine configuration