The following information relates to the only product sold by Harper Company. Sales price per unit Variable cost per unit Fixed costs per year 45 27 273,000 a. Compute the contribution m b. Assuming that the company sells 20,000 units during the current year, compute the margin of safety (in dollars) argin ratio and the dollar sales volume required to break even. a. Contribution margin ratio Break even sales dollars b. Margin of safety (in dollars)