After a 20% discount on a book, the discount is 9.6 yuan. How much is the original price of this book?
一本书打八折后，优惠了9.6元，这本书原价多少元？
<gadget id="calculator">80 / 100</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">1 - (4/5)</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">9.6 / (1/5)</gadget>
<output>48</output>

<result>48</result>