If a book is priced at 10 yuan, it can make a profit of 25%. If it wants to make a profit of 40%, how much should it be priced at?
一种书定价10元，可以盈利25%，若要盈利40%，则应该定价多少元．
<gadget id="calculator">25 / 100</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 + (1/4)</gadget>
<output>5/4 = around 1.25</output>

<gadget id="calculator">10 / (5/4)</gadget>
<output>8</output>

<gadget id="calculator">40 / 100</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">1 + (2/5)</gadget>
<output>7/5 = around 1.4</output>

<gadget id="calculator">8 * (7/5)</gadget>
<output>56/5 = around 11.2</output>

<result>56/5 = around 11.2</result>