Shetfield Industries seils threedifferent sets of sportswean Sleek sells for $50 and has unit variable costs of $38,5mooth sells for $70 and has unit variable costs of $50, Potent sells for $80 and has unit varlable costs of $60. The sales mix of the three sets is: 51 cek, 50%6. Smooth, 30%6 and Potent, 2006 . What is the weighted-average unit contribution margin? Weighted-average unit contribution margin