10. Assuming a MARR of 15%, use incremental analysis (defender vs challenger approach) with the following table: Thousand $ A B initial cost -5 -6.5 -4.5 -5.6 annual benefit 3.1 2.85 3.5 salvage value 3.7 4.8 3.2 4.3 useful life (yrs) Perform IRR calculations in Excel to determine the first defender. Identify the defender and its IRR value Perform incremental analysis with the first challenger, State what happens and the IRR value. Perform incremental analysis with the next challenger. State what happens and the IRR value