1. The problem statement, all variables and given/known data At Bernie’s Bargain everything is sold for 20% less than the marked price marked. If Bernie buys radios for 80$, what price should he mark them if he wants to make a 20% profit on his cost? 2. Relevant equations I don’t know the equation for selling price. From Internet I got this: SP – cost = gross margin But this is not working: SP -80 = 40% SP – 0.4 = 80 0.6SP = 80 SP = 133.33 Which is wrong 3. The attempt at a solution Calculating the profit on 80$. 20/100 * 80 = 16 There after adding profit to the cost we get 96$. Now I don’t know how to find the selling price in which we would adding the 20% discount also. Some body please guide me. Zulfi.