Cullumber Company produces a single product. It sold 78,750 units last year with the following results: In an attempt to improve its product, Cullumber is considering replacing a component part in its product that has a cost of $5 per unit with a new and better part costing $10 per unit during the coming year. A new machine would also be needed to increase plant capacity. The machine would cost $75,600, with a useful life of six years and no salvage value. The company uses straight-line depreciation on all plant assets. (a) What was Cullumber's break-even point in units last year? Break-even point units Attempts: 0 of 1 used (b) The parts of this question must be completed in order. This part will be available when you complete the part above. (c) The parts of this question must be completed in order. This part will be available when you complete the part above. (d) The parts of this question must be completed in order. This part will be available when you complete the part above