Use the modified internal rate of return approach (MIRR) with an investment rate of 20% per year and a borrowing rate of 12% to find the external rate of return for the following cash flows. Year Net Cash Flow ($) 0 +16,000 Year Net Cash Flow ($) -12,000 0 +16,000 b. Use the Return on invested capital (ROIC) approach with an investment rate of 20% per year to find the external rate of return for the following cash flows. 2 -25,000 1 -12,000 3 +60,000 2 -25,000 3 +60,000