Part 1

The contribution margin ratio is the same as profit the same as the variable cost ratio the portion of equity contributed by the stockholders the same as the profit-volume ratio

Part 2

If variable costs per unit increased because of an increase in hourly wage rates, the break-even point would remain the same increase increase or decrease, depending upon the percentage increase in wage rates decrease

Part 3

The relative distribution of sales among the various products sold by a business is the contribution margin mix sales mix product portfolio business's basket of goods