under this product mix. Hint: Enter your numbers with commas as given in the question, e.g 4,000 not 4000 Bike type Margin (sh) Weighted-Average Sales Mix Contribution Contribution Margin (sh) Bike For Us manufactures mountain bikes. It has fixed costs of Sh 4,140,000. Bike For Us's sales mix, prices, and costs per unit is shown as follows: Bike type Sales Mix Selling price (Sh) Variable costs (Sh) Green 25% 4,000 2,800 Brown 45% 2,000 1,400 Green 25% Blue 30% 1,000 Brown 45% 600 Blue 30%