swan textiles inc. produces and sells a decorative pillow for​ $97.50 per unit. in the first month of​ operation, 2,300 units were produced and​ 1,900 units were sold. actual fixed costs are the same as the amount budgeted for the month. the fixed cost budget is based on the production of​ 2,300 units. other information for the month​ includes: variable manufacturing costs ​$22.00 per unit variable marketing costs ​$7.00 per unit fixed manufacturing costs ​$16 per unit administrative​ expenses, all fixed ​$20.00 per unit ending​ inventories: direct materials 0 wip 0 finished goods 400 units what is the contribution margin using variable​ costing?