D Question 9 2 pts Contribution margin is profit O another term for volume in the "cost-volume-profit" analysis O the same as sales revenue O the excess of sales revenue over variable cost Question 10 2 pts Which of the following describes the behavior of a variable cost per unit? O remains constant with changes in the activity level O varies in decreasing proportion with changes in the activity level varies in increasing proportion with changes in the activity level ) varies in direct proportion with the activity level