Boise Corporation had a margin of safety of $393,000 last month, with sales revenue of $1,000,000 and fixed costs of $285,290. Required: a. What are break-even sales? b. What is the contribution margin ratio? c. How much profit did Boise earn last month? d. How much would sales have to increase for Boise to earn profit of $721,920? Complete this question by entering your answers in the tabs below. Required A Required B Required C What are break-even sales? Break-Even Sales Required D