In a certain state, gasoline stations compute the price per gallon p, in dollars, charged at the pump by adding a 5 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?  Choose the correct choice from the following answers:
A) d= (p-0.18)/1.05	B) d = (p-0.05)/1.18	C) d = p/1.23	D) d = p-0.23	E) d = p/1.05 - 0.18
Let dealers price (d) be 1. so adding 5% to dealers price is d+ 5% of d. i.e. 1 + 5% of 1 which is1 + 0.05. then add 0.18 to the value.   Now 1.05 + 0.18. this is now 1.23. you have the gasoline stations price (p) as 1.23 dollars.   Now sub 1.23 in the options to know which option gave you d = 1. d must equal 1 because you earlier picked 1 as the value of d in the question.   PS: always remember to start from E upwards.   d= (p-0.18)/1.05nswer : d= (p-0.18)/1.05
<result>A</result>
In a certain state, gasoline stations compute the price per gallon p, in dollars, charged at the pump by adding a 5 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?