The original price of a book is 30 yuan, and the current price is 24 yuan. How much more expensive is the original price than the current price?
一本书原价30元，现价24元，原来的价钱比现在贵百分之几？
<gadget id="calculator">30 - 24</gadget>
<output>6</output>

<gadget id="calculator">6 / 24</gadget>
<output>1/4 = around 0.25</output>

<result>1/4 = around 0.25</result>