7. East Company sells a product with a postive contribution margin. If the selling price and the variable cost per unit both increase 10 per cent and the total fixed costs do not change, what is the effect on the contribution margin per unit and contribution margin ratio and the break-even point in units? Contribution Contribution Break-even margin per unit marginatio units a. No changeNo chang b. Increase c) Increase d. Increase e. No chang Increase Increase o change lt Decrease t Increase No change No change ecrease