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For Concord Corporation, sales is $ 580000, variable expenses are $ 435000, and fixed expenses are $ 140000. Concord's contribution margin ratio is 1%. 25%. 75%. O 24%. For Swifty Corporation at a sales level of 4000 units, sales is $75000, variable expenses total $68000, and fixed expenses are $21000. What is the contribution margin per unit? O $18.75 O $17.00 $5.25 O $1.75