tiger golf accessories sells golf shoes, gloves and a laser-guided range-finder that measures distance. shown below are unit cost and sales data. pair of shoes unit sales price $120 unit variable costs 60 unit contribution margin $60 sales mix 30% pairs of gloves unit sales price $50 unit variable costs 20 unit contribution margin $30 sales mix 40% range finder unit sales price $230 unit variable costs 210 unit contribution margin $20 sales mix 30%