Question 18 2 pts Select the incorrect statement regarding the contribution margin income statement. Assuming no change in fixed costs, a $1 increase in contribution margin will result in a $1 increase in profit. O Contribution margin represents the amount available to cover fixed expenses and thereafter to provide profit. The contribution margin approach for the income statement is acceptable for external reporting. The contribution margin approach requires that all costs be classified as fixed or variable. Question 19 2 pts The Riverland's Lawn Care incurs significant gasoline costs. This cost would be classified as a variable cost if the total gasoline cost