Your cat's summer kitty-cottage needs a new roof. A You feel a 15-year analysis period is in line with your cat's remaining lives. (There is no salvage value old roofs.) Thatch $200 50 Slate $350 20 First cost Annual upkeep Service life, in years Construct a choice table for interest rates from 0% to 100% (b) Which roof should you choose if your MARR is 12%? what is the actual value of the IRR on the incremental cost