Sentra Inc. manufactures three types of graphic calculators: Super Deluxe, Deluxe and Regular. The budgeted data for the last quarter are given below: Super Deluxe Deluxe Regular Selling price Variable cost per unit Contribution margin per unit Sales volume in units $373 $181 $192 10,215 270 100 170 38,817 140 80 60 53,118 Actual operating data for the last quarter are given below: Super Deluxe Deluxe Regular Required: Selling price Variable cost per Contribution Sales volume in unit margin per unit units $370 280 110 $175 96 $195 12,360 184 42,230 76 34 48,410 a. Compute the actual and budgeted contribution margins in dollars for each product for the last quarter. b. Calculate the actual and budgeted sales mixes for the three products for the last quarter. c. Calculate the total sales-volume, sales mix and sales quantity variances for the quarter. All the variances are to be computed in terms of contribution margins.