A reduction in the price of petrol by 10% enables a motorist to buy 5 gallons more for $300. Find the original price of petrol? Choose the most appropriate option
A) $11	B) $5	C) $45	D) $400	E) $6.6
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 300/45=$6.6   Answer: $6.6.
<result>E</result>
A reduction in the price of petrol by 10% enables a motorist to buy 5 gallons more for $300. Find the original price of petrol?