Margin of Safety Head-First Company plans to sell 4,960 bicycle helmets at $74 each in the coming year. Unit variable cost is $45 (includes direct materials, direct labor, variable factory overhead, and variable selling expense). Total fixed cost equals $49,500 (indludes fixed factory overhead and fixed selling and administrative expense). Break-even units equal 1,707. Required: the number of units. 1. Calculate the margin of safety in terms units 2. Calculate the margin of safety in terms e sales revenue