10. Sonor Systems undertakes its own machine maintenance. The depreciation on the equipment is $20,000 per year and operating cost is $2 per machine hour. Last year 275,000 machine hours were used to produce 100,000 units. Develop a cost equation for the total machine maintenance cost. a. Y= $275,000 b. Y = $20,000 c. Y = $20,000 + $2 MHR d. Y = $2 MHR