The cost of Mathematics book is $25 \large\frac{3}{4}$ and that of Science book is $20\large\frac{1}{2}$. Which costs more and by how much?

Question

( A ) Mathematics book by $5\large\frac{1}{4}$
( B ) Mathematics book by $5\large\frac{3}{4}$
( C ) None of these
( D ) Mathematics book by $\large\frac{1}{4}$