Craylon Manufacturing produces a single product that sells for $ 120. Variable costs per unit equal $ 30. The company expects total fixed costs to be​ $60,000 for the next month at the projected sales level of 1 comma 200 units. In an attempt to improve​ performance, management is considering a number of alternative actions. Each situation is to be evaluated separately. Suppose that management believes that a $ 10 comma 000 increase in the monthly advertising expense will result in a considerable increase in sales. Sales must increase by​ ________ to justify this additional expenditure.