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If you could do all Three questions! or the most as possible, Thanks !!!

The Dean Company has sales of $500,000, and the break-even point in sales dollars of $300,000. Determine the company's margin of safety percentage. A business had a margin of safety ratio of 20%, variable costs of 75% of sales, fixed costs of $240,000, a break- even point of $960,000, and operating income of $60,000 for the current year. Calculate the current year's sales. Cordell, Inc. has an operating leverage of 3. Sales are expected to increase by 9% next year. What is the expected change in operating income next year