A reduction in the price of petrol by 10% enables a motorist to buy 5 gallons more for $250. Find the original price of petrol? Choose the correct choice from the following answers:
A) $11
B) $5
C) $45
D) $400
E) $5.5
Price decreased by 10%, so 9/10 times, which means that original gallons bought increased 10/9 times. Since this increase equals to 5 gallons then 45 gallons were bought originally (45*10/9=50 --&gt; increase 5 gallons). Hence original price was 250/45=$5.5   Answer: $5.5.
<result>E</result>
A reduction in the price of petrol by 10% enables a motorist to buy 5 gallons more for $250. Find the original price of petrol?