3. Assuming a MARR of 20%, use incremental analysis (defender vs challenger approach) to select the best choice among the four alternatives: A Initial cost 2500 4800 4200 3600 Annual benefit 850 700 850 1300 Salvage value 2500 1750 1250 3000 Useful life (yrs) 5 4. Use IRR and incremental analysis, assuming a MARR of 20%, to solve problem 83. 5. Use Benefit to Cost (B/C) ratio and incremental analysis to solve problem #3