Ozark Company's high and low level of activity last year was 3,000 units of product produced in June and 1000 units produced in October. Machine maintenance costs were $108,000 in June and $50,000 in October. Using the high-low method, determine an estimate of total maintenance cost for a month in which production is expected to be 1.000 units. $50,400 $70,000 $103,600 $61,600