## Elementary Algebra

Let s represent the selling price. We can use the following guideline to solve this problem: Selling price = Cost + Profit s = 0.50 + 130% $\times$ 0.50 s = 0.50 + 1.3 $\times$ 0.50 s = 0.50 + 0.65 s = 1.15 One head of lettuce should be sold for 1.15 dollars.