3. Suppose Riverside sells its canoes for $518 each. Calculate the contribution margin per canoe and the contribution margin ratio. (Round your contribution margin to the nearest whole dollar and your contribution margin ratio to the nearest whole percent.) Unit Contribution Margin Contribution Margin Ratio 4. Next year Riverside expects to sell 840 canoes. Complete the contribution margin income statement for the company. RIVERSIDE INC Contribution Margin Income Statement For the Next Year Contribution Margin Net Operating Income