The Company interest rate (MARR) is 12%, and "Do Nothing" is an option. Use both NPW and the INCREMENTAL ANALYSIS METHOD to calculate the IRR and decide which machine should be purchased. Also, consider "do-nothing" as an alternative. (DO NOT CALCULATE THE EXACT INTERNAL RATE OF RETURN FOR EACH COMPARISON!!! USE MARR AS YOUR DECISION POINT.) The Company interest rate (MARR) is 12%, and "Do Nothing" is an option. Use both NPW and the INCREMENTAL ANALYSIS METHOD to calculate the IRR and decide which machine should be purchased. Also, consider "do-nothing" as an alternative. (DO NOT CALCULATE THE EXACT INTERNAL RATE OF RETURN FOR EACH COMPARISON!!! USE MARR AS YOUR DECISION POINT.)