## Elementary Algebra

Let s represent the selling price. The basic relationship is: selling price equals cost plus profit. Selling price = Cost + Profit Selling price = s Cost = 28 Profit = 30% of the selling price = 30% $\times$ s = 0.3s So, s = 28 + 0.3s 0.7s = 28 Divide both sides by 0.7 s = 40 The price should be 40 dollars.