I have a required rate of return of 12%. I also have an accounting rate of return of 7.96%. For an investment of $1,670,000 with 10 years of cash inflows of $289,884 each and in year 10 an additional $99,700 of salvage value from the asset initially purchased (the investment). How do I calculate IRR and MIRR? Should I be using the rate of 7.96? Or should I be using the rate of 12%?

Also, when I look at the PV annuity table for my present values, should I be using 7.96% (round up to 8% for 10 years)?