The Corata Appliance Manufacturing Corporation manufactures two vacuum cleaners, the Standard and the Super. The following information was gathered about the two products: Budgeted sales in units Budgeted selling price Budgeted contribution margin per unit Actual sales in units Actual selling price Super Standard 2,400 610 $600 $1,700 $430 $1,060 2,800 1,300 $650 $1,680 What is the total sales-volume variance in terms of the contribution margin? OA $731,400 unfavorable OB. $559,400 favorable OC. $903,400 unfavorable OD. $903,400 favorable