Contribution Margin Analysis The actual variable cost of goods sold for a product was $25 per unit, per unit, while the planned variable cost of goods sold was $29 per unit. The volume decreased by 5,600 units to 69,900 actual total units. Enter all amounts as positive numbers. a. Determine the variable cost quantity factor. $fill in the blank 1 b. Determine the unit cost factor for variable cost of goods sold. $fill in the blank 3