Margin of Safety Head-First Company plans to sell 4,910 bicycle helmets at $70 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 (includes fixed factory overhead and fixed selling and administrative expense). Break-even units equal 1,980. Required: 1. Calculate the margin of safety in terms of the number of units. units 2. Calculate the margin of safety in terms of sales revenue. S