8. 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. Suppose management believes that a $75,000 increase in the monthly advertising expense will result in a considerable increase in sales. Sales must increase by how much to justify this additional expenditure? A) 1,698 units B) 1,500 units C) 1,550 units D) 1,339 units