Problem Solving

In a certain state, gasoline stations compute the price per gallon p, in dollars, charged at the pump by adding a 4 percent sales tax to the dealer's price per gallon d, in dollars, and then adding a gasoline tax of $0.18 per gallon. which of the following gives the dealer's price per gallon d in terms of the price per gallon p charged at the pump?


1. d=p-0.22
2. d=p/1.22
3. d=(p/1.04 ) -0.18
3. d=(p-0.18)/1.04
4. d=(p-0.04)/1.18