Question 16 O pts The XRCise Physical Therapy Practice charges $50 per unit of physical therapy services delivered. The profit-volume margin percentage for the practice is 70%, leading to the conclusion that variable costs are equal to $15 per unit. Fixed costs for XRCise are $100,000. (a) How many units of service must XRCise render in order to break even? (b) How many units of service must XRCise render in order to make a profit of $75,000? You can earn up to 5 points for this question; 2.5 per response. To obtain full credit for either question you MUST show your work.