Which of the following would produce no change in the contribution margin per unit? Select one: a. A 15% decrease in selling price. b. None of the given of answers. O c. A 14% increase in variable cost. O d. A 7% increase in selling price. Oe. A 17% decrease in fixed cost. of XYZ company currently sells 15,000 units a month for $50 each, has variable costs of $20 per unit, and fixed $300,000. The company is considering increasing the price of its units to $80 per unit. If the price is changed, how many units will the company need to sell for profit to remain the same as before the price change? Select one: a. 10,000 b. None of the given answers. c. 7.500 d. 11,250 e. 9,000