Electrical costs at one of Omar Corporation's factories are listed below: Machine-Hours Electrical Cost April 3,553 $36,302 May 3,627 $36,833 June 3,625 $36,800 July 3,565 $36,366 August 3,548 $36,237 September 3,542 $36,213 Management believes that electrical cost is a mixed cost that depends on machine-hours. Use the high-low method - estimate a cost formula for Omar's corporation's expenses. How Much is the variable expenses per unit? Round the number to the nearest one digit