A book is priced at 24 yuan after a 25% discount. How much is this book cheaper than the original price?
一本书打七五折后的售价是24元，这本书比原价便宜了多少元？
<gadget id="calculator">75 / 100</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">24 / (3/4)</gadget>
<output>32</output>

<gadget id="calculator">32 - 24</gadget>
<output>8</output>

<result>8</result>