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11. (12 marks) (For this question you must show your work!) Tania's Catering has a monthly target operating income of $12,000. Variable expenses are 40% of sales and monthly fixed expenses are $4,800. a. What is the monthly margin of safety in dollars if Tania's Catering achieves its' operating income goal? b. What is Tania's operating leverage factor at the target level of operating income? C. If sales revenue increases by 15%, by what percentage will Operating Income increase