Which of the following statements is true? Total unit sales needed to reach a given target profit is computed by dividing the target profit by the contribution margin per unit The smaller the contribution margin ratio, the larger the amount of sales required to cover a given amount of fixed expenses Assuming total sales do not change, a shift in the sales mix from high-margin items to low-margin items will increase the weighted average contribution margin If total fixed costs increase and all other factors remain the same, the contribution margin ratio will decrease