Required information (The following information applies to the questions displayed below.) CompuWorld sells two products, R66 and R100, and calculates sales variances using the contribution margin. Pertinent data for the current year follow: Selling price Variable cost per unit Contribution margin Fixed cost per unit Operating income Sales in units Budgeted R66 R100 $ 50 $ 160 40 90 $ 10 $ 70 6 30 $ 4 $ 40 Actual R66 R100 $ 55 $ 155 43 95 $ 12 $ 60 5 25 $ 7 $ 35 1,200 400 1,000 1,000 What is the total sales volume variance? Total sales volume variance