At the breakeven point, return on sales is above target. the number of units sold is the budgeted sales quantity. O contribution margin is equal to total fixed costs. O revenues equal zero. Which of the following statements is true? Variable costs increase on a per-unit basis as activity increases. Step costs increase in total with each increase in activity level. Mixed costs decrease in total as activity decrease but not all the way to zero dollars. Fixed costs do not change on a per-unit basis