Решение:
\[ \frac{1}{4} = \frac{1 \times 25}{4 \times 25} = \frac{25}{100} \]
\[ \frac{3}{25} = \frac{3 \times 4}{25 \times 4} = \frac{12}{100} \]
\[ \frac{25}{100} - \frac{12}{100} = \frac{25 - 12}{100} = \frac{13}{100} \]
Ответ: 13/100