13. Machine hours and electricity costs for Wells Industries for last year were as follows: Month January February March April May vauna TC Machine Hours 2,000 2,320 1,520 Z480 3,040 2,640 3,280 2,800 1,600 2,960 3,760 3,360 Electricity Costs $9,200 10,500 6,750 11,500 -lasi June 14,125 July August September October 11,000 12,375 11,375 7,750 13,000 15,500 13,875 YOOuor koor Ofry November December hign Required: Using the high-low method, develop an estimate of variable electricity costs per machine hour. 3.1 Using the high-low method, develop an estimate of fixed electricity costs per month. Using the high-low method, develop a cost function for monthly electricity costs. Estimate electricity costs for a month in which 3,000 machine hours are worked. A. . . D