XYZ Inc sells a single product for $30 per unit Variable production costs are $18 per unit. Fixed overhead costs amount $20,000 per month Variable selling costs are $3 per unit. Fixed selling costs are $4,000 per month. Last month the company produced 10,000 units and sold 7,000 units. What is the company's margin of safety? a $130,000 b. $20,000 c. $40,000 d $80.000