There are two 100 HP motor which are being considered to use: Purchase price Efficiency Annual maintenance expenses Estimed market value ABC Brand XYZ Brand $1.900 $6.200 80% 90% $170 $310 none none 10 years 10 years Useful life a. If electricity cost is $0,10/kWh, with interest of 12% annually, how many hours should two motors operate annually so that both of motors cost are equal. (1 hp 0,746 kW) b. Based on answer "a" which motor do you prefer to operate at 2000 hours a year. And elaborate your reason