Miller Metal Co. makes a single product that sells for $42.5 per unit. Variable costs are $27.3 per unit, and fixed costs total $65,055 per month. Required: a. Calculate the number of units that must be sold each month for the firm to break-even. (Do not round intermediate calculations.) Break-even volume 4.28units b. Assume current sales are $414,000. Calculate the margin of safety and the margin of safety ratio. (Round intermediate calculations to the nearest whole number.) Margin of safety Margin of safety ratio C.Calculate operating income if 6,800 units are sold in a month. (Do not round intermediate calculations.)