At an activity level of 6,400 units in a month, total variable maintenance cost is $120,000 and its total fixed maintenance cost is $ 95,500. What would be the total maintenance cost, both fixed and variable, at an activity level of 6,600 units in a month? Assume that this level of activity is within the relevant range. $219,250 .a $215,500 .b $222,234 .C $215,488 .d Which of the following businesses ?are applying Job Order Costing Tortilla manufacturer Mushroom manufacturing.b farm Food catering business C Cattle production business .d