A girl sold a book at a profit of 7%. Did she sold it for Rs.7.50 more, 22% would have been gained. Find the CP?  Select the correct option: A) 20% B) 30% C) 50% D) 60% E) 70%
50%   50%
<result>C</result>
A girl sold a book at a profit of 7%. Did she sold it for Rs.7.50 more, 22% would have been gained. Find the CP?