The price of a gallon of gasoline was $30 on the 15th of March. By the 15th of April, the price per gallon had increased by 20%, and by the 15th of May the price had increased again to a total of $45 per gallon. What was the percent change in the price of a gallon of gasoline between the 15th of April and the 15th of May?	Choose one:
A) 20%
B) 25%
C) 30%
D) 35%
E) 50%
Price of a gallon of gasoline was $30 on the 15th of March   Price of a gallon of gasoline increased by 20 %so the price on 15th of April = 1.2*30= 
<gadget id="calculator">1.2*30</gadget>
<output>36</output>
$36   Price of a gallon of gasoline was $45 on 15th of May   so there was a increase of $9 from 15th of april to 15 th of may   % increase= 9/36 * 100= 
<gadget id="calculator">9/36 * 100</gadget>
<output>25</output>
25 %   Correct answer - 25%
<result>B</result>
The price of a gallon of gasoline was $30 on the 15th of March. By the 15th of April, the price per gallon had increased by 20%, and by the 15th of May the price had increased again to a total of $45 per gallon. What was the percent change in the price of a gallon of gasoline between the 15th of April and the 15th of May?