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 Actual R66 R100 R66 R100 $ 56 $ 236 $ 61 40 $ 16 10 131 $ 105 49 43 $ 231 136 $ 18 $ 95 $ 6 $ 56 $ 9 9 $ 51 44 1,950 590 1,350 1,350 What is the total sales volume variance? Total sales volume variance