A reduction in the price of petrol by 10% enables a motorist to buy 5 gallons more for $280. Find the original price of petrol?  Choose the correct choice from the following options
A) $11  B) $5  C) $45  D) $400  E) $6.2
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 280/45=$6.2   Answer: $6.2.
<result>E</result>
A reduction in the price of petrol by 10% enables a motorist to buy 5 gallons more for $280. Find the original price of petrol?