Blue Spruce Industries sells three different sets of sportswear. Sleek sells for $22 and has unit variable costs of $6; Smooth sells for $42 and has unit variable costs of $12; Potent sells for $52 and has unit variable costs of $32. The sales mix of the three sets is: Sleek, 50%; Smooth, 30%; and Potent, 20%. What is the weighted-average unit contribution margin? Weighted-average unit contribution margin $