A book is priced at 33.8 yuan after a 35% discount. How much is the current price cheaper than the original price?
一本书打六五折后的售价是33.8元，现价比原价便宜了多少元？
<gadget id="calculator">65 / 100</gadget>
<output>13/20 = around 0.65</output>

<gadget id="calculator">33.8 / (13/20)</gadget>
<output>52</output>

<gadget id="calculator">52 - 33.8</gadget>
<output>18.2</output>

<result>18.2</result>