Duncan had revenues of $$900,000$ in March. Fixed costs in March were $$480,000$ and profit was $$60,000.$ Answer the following questions:Required:Items Answers$10.$ What was the contribution margin ratio?$\_\_\_\_\_\_\_\%($Type the figure only in your answer, e$.$g$.1000)3$ marks$11.$ What monthly sales volume $($in dollars$)$ would be needed to break even?$$\_\_\_\_\_\_\_($Type the figure only in your answer, e$.$g$.1000)3$ marks$12.$ What was the margin of safety in dollars for March?$$\_\_\_\_\_\_\_($Type the figure only in your answer, e$.$g$.1000)3$ mark