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15. Dental Comfort Services provides dental cleanings to its patients. The selling price of a cleaning is $150 and the variable costs associated are $85. The monthly relevant fixed costs are $10,000. Required: a. What is the breakeven point in cleanings? b. What is the margin of safety in dollars, assuming sales total $30,000? c. What is the breakeven level in cleanings, assuming variable costs decrease by 20%? d. What is the breakeven level in dollars, assuming the selling price goes down by 10% and fixed costs increase $1,000 per month