Calley Co.s margin of safety for the last period was 20%. The company incurred $900,000 in fixed costs for the period and its contribution margin ratio was 25%. The break-even was calculated at 12,000 units. What were the actual total sales revenues for the period? a) $225,000 b) $1,500,000 c) $4,320,000 d) $4,500,000