There are 50 story books and 40 science books in the library. How many percent are the science books less than the story books?
图书室有故事书50本，科技书40本，科技书的本数比故事书少百分之几？
<gadget id="calculator">50 - 40</gadget>
<output>10</output>

<gadget id="calculator">10 / 50</gadget>
<output>1/5 = around 0.2</output>

<result>1/5 = around 0.2</result>