English books = \( \frac{2}{5} \) of all books. \( \frac{3}{4} \) of English are fiction, so \( \frac{1}{4} \) of English are non-fiction.<br><br>
&bull; Non-fiction English = \( \frac{1}{4} \times \frac{2}{5} = \frac{2}{20} = \frac{1}{10} \)<br><br>
Check: Fiction English = \( \frac{3}{4} \times \frac{2}{5} = \frac{3}{10} \). Total English = \( \frac{3}{10} + \frac{1}{10} = \frac{4}{10} = \frac{2}{5} \). ✓<br><br>
Final Answer: \( \frac{1}{10} \)