If 10 gallons of grape juice are added to 40 gallons of a mixture, which contains 10 percent grape juice then what percent of the resulting mixture is grape juice? Choose the most appropriate option:
A) 14%	B) 25%	C) 28%	D) 34%	E) 50%
Mixture contains 4 gallons of grape juice out of 40 gallons   After addition: 14 gallons of grape juice out of 50 gallons ==&gt; 28%   Answer 28%
<result>C</result>
If 10 gallons of grape juice are added to 40 gallons of a mixture, which contains 10 percent grape juice then what percent of the resulting mixture is grape juice?