please help No.2 and extra credit part

Use IRR analysis to calculate the following based on the attached file: lastname firstname quiz data.xlsx 1) The best alternative based on IRR (20 points) 2) The incremental rate of return for the best alternative (20 points) Assume MARR - 15% Extra Credit: Calculate when the best alternative begins to make a profit based on the discount rate (10 points) Capital Cost Revenue Maintenance Operations Salvage Useful Life Alternative 620000 521000 16000 8000 43000 20 B 738000 830000 22000 11000 52000 20 647000 431000 8000 4000 45000 20 Use IRR analysis to calculate the following based on the attached file: lastname firstname quiz data.xlsx 1) The best alternative based on IRR (20 points) 2) The incremental rate of return for the best alternative (20 points) Assume MARR - 15% Extra Credit: Calculate when the best alternative begins to make a profit based on the discount rate (10 points) Capital Cost Revenue Maintenance Operations Salvage Useful Life Alternative 620000 521000 16000 8000 43000 20 B 738000 830000 22000 11000 52000 20 647000 431000 8000 4000 45000 20