Lululemon needs help pricing a pair of leggings. The cost to produce one pair of leggings is $15.75. Compare the selling price of one pair of leggings with a 40% markup based on cost to the selling price of one pair of leggings with a 28.57% markup based on selling price. . Calculate the selling price when the markup is based on cost. Calculate the selling price when the markup is based on selling price.