For each of the following changes, indicate the effect on contribution margin and breakeven point. Use + for increase, – for decrease, and 0 for no effect.

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Change (a) New data analytics software and computer installed; no change in selling price or variable costs (b) Increase in sales of the product with the highest contribution margin relative to sales of the product with the lowest contribution margin (c) Decrease in cost of raw materials Contribution Breakeven Margin Point