4 The following information relates to the only product sold by Harper Company 10 points Sales price per unit Variable cost per unit Fixed costs per year $ 45 27 282,000 eBook Print a. Compute the contribution margin ratio and the dollar sales volume required to break even. b. Assuming that the company sells 20,000 units during the current year, compute the margin of safety (in dollars) a. Contribution margin ratio Break even sales dollars b. Margin of safely (in dollars)