A manufacturer sold 6,900 units of its product at the price of $40 last year. The variable cost per unit was $24. Their degree of operating leverage was 4. What was the margin of safety in $) for this company last year? (All answers are whole numbers -- unless specified otherwise. You should NOT include the $ sign or a comma. E.g., you should type 1000 for one thousand. Negative numbers should be added with a minus sign, e.g., -1000 for a decrease or loss of one thousand.) Margin of Safety = $