A book is 5% off, 2 yuan cheaper. How much is the original price of this book?
一本书打九五折，便宜2元，这本书的原价为几元？
<gadget id="calculator">95 / 100</gadget>
<output>19/20 = around 0.95</output>

<gadget id="calculator">1 - (19/20)</gadget>
<output>1/20 = around 0.05</output>

<gadget id="calculator">2 / (1/20)</gadget>
<output>40</output>

<result>40</result>