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For these problems: (1) determine how many roots are possible and (2) graph the PW versus the interest rate to see whether multiple roots occur. If the root is a unique IRR, it is the project's rate of return. If there are multiple roots, then use an external investing rate of 12% and an external borrowing rate of 6%. Compute and use the MIRR as the project's rate of return. Problem 7A-6 A firm invested $15,000 in a project that appeared to have excellent potential. Unfortunately, there was a lengthy labor dispute in Year 3. Compute the project's rate of return. there the project's rate of Year 2 3 4 5 6 Cash flow $15000 10000 6000 8000 4000 4000 4000