The selling price of a book with a 25% discount is 12 yuan. What is the original price of this book?
一本书打七五折出售的售价是12元，这本书的原价是多少元．
<gadget id="calculator">75 / 100</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">12 / (3/4)</gadget>
<output>16</output>

<result>16</result>