National Homebuilders, Inc., plans to purchase new cut-and-finish equipment. Two manufacturers offered the estimates below. If MARR-15%, the equation for computing the present worth of vendor B is Vendor A Vendor B First Cost, $ -15,000 -18000 Annual cost, $ per -3500 -3100 year Salvage Value, $ 1000 2000 Life, years 6 9 PW(B)-18,000(P/F, 15 %, 9) -18,000 (P/F, 15%, 18)-3,100 ( P/A, 15%, 18)+2,000(P/F, 15%, 9) + 2,000 (P/F, 15%, 18) PW(B) -18,000-18,000 (P/F, 15%, 9) -3,100 ( P/A, 15%, 18)+2,000(P/F, 15%, 9) PW(B)=-18,000-18,000 (P/F, 15%, 9) -18,000 (P/F, 15%, 18)-3,100(P/A, 15%, 18) +2,000 (P/F, 15 %, 9)+2,000 (P/F, 15%, 18) PW(B)=-18,000-18,000 (P/F, 15%, 9) -3,100 (P/A, 15%, 18)+2,000(P/F, 15%, 9) +2,000 (P/F, 15%, 18)