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4a. The point where the blue line Intersects the Y-axis (the vertical axis) Indicates which of the following statements is true? The company's total expense at all sales volumes between zero and 50,000 units is $90,000. The company's total fixed expense at all sales volumes between zero and 50,000 units is $90,000. The company's total variable expense at all sales volumes between zero and 50,000 units is $90,000. The company's total contribution margin at all sales volumes between zero and 50,000 units is $80,000. 4b. For each Increase of one unit on the X-axis (the horizontal axis), the amount on the Y-axis (the vertical axis) Increases by The contribution margin per unit The selling price per unit. The pront margin per unit The variable expense per unit 4c. If the selling price per unit decreased and the variable expense per unit and total fixed expense remained unchanged, then which of the following statements is true? The line shown in the profit graph would shift to a V-shape The one shown in the profit graph would not change The line shown in the pront graph would steepen. The line shown in the profit graph would natten out