8. Assuming a MARR of 10%, use incremental analysis (defender vs challenger approach) with the following table Thousand $ A B C D initial cost -5 -6.5 -4.5 -5.6 annual benefit 3.1 2.85 salvage value 3.7 4.8 3.2 4.3 useful life (yrs) 3 3.5 2 Use PW to determine the first defender. Identify the defender and its PW value. Perform incremental analysis with the first challenger. State what happens and the PW value. Perform incremental analysis with the next challenger. State what happens and the PW value