A reduction in the price of petrol by 10% enables a motorist to buy 5 gallons more for $200. Find the original price of petrol?
Pick:
A) $11
B) $5
C) $45
D) $400
E) $4.4
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 200/45=$4.4   Answer: $4.4.
<result>E</result>
A reduction in the price of petrol by 10% enables a motorist to buy 5 gallons more for $200. Find the original price of petrol?