Two 110 Kw motors are being considered for installation $4,500 and an operating efficiency of 83%, while second motor costs $3,600 and an elfMEGY rating of 80%. Both motors have zero salvage value after a life of 10 years The annast operating & maintenance cost (except power cOst) amounts to 15% of the original cont of each motor. The power costs are a flat 5 cents per Kilowatt bout. What is the minimum names of hours of opcrations per year necessary to justify the purchase of the more expensive things i= 6%??