Tony Manufacturing produces a single product that sells for $80. Variable costs per unit equal $30. The company expects total fixed costs to be $78,000 for the next month at the projected sales level of 2,500 units. In an attempt to improve performance, management is considering a number of alternative actions. Each situation is to be evaluated separately. Suppose management believes that a $77,500 increase in the monthly advertising expense will result in a considerable increase in sales. Sales must increase by to justify this additional expenditure Select one: a. 1,698 units b. 1,500 c. 1,339 units d. 1,550 units