3. Evaluate the two machines below, using ROR analysis. Which machine should be selected, if MARR is 10%? Remember, the ROR equation should be set up to ensure equal service. Mach A Mach B First cost ($) -15,000 -25,000 AOC ($) -1,600 -400 Salvage value (4) 3,000 6,000 Life (yrs) 3 6