polaris inc. manufactures two types of metal stampings for the automobile industry: door handles and trim kits. fixed cost equals $146,000. each door handle sells for $12 and has variable cost of $9; each trim kit sells for $8 and has variable cost of $5. required: 1. what are the contribution margin per unit and the contribution margin ratio for door handles and for trim kits? round the ratios to three decimal places. line item description door handles trim kits contribution margin per unit $fill in the blank 1 $fill in the blank 2 contribution margin ratio fill in the blank 3 fill in the blank 4 2. if polaris sells 20,000 door handles and 40,000 trim kits, what is the operatin