The price of a commodity is 56 yuan after a 20% discount, how much is the price reduction?
一件商品，打八折后售价是56元，降价多少元．
<gadget id="calculator">80 / 100</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">56 / (4/5)</gadget>
<output>70</output>

<gadget id="calculator">70 - 56</gadget>
<output>14</output>

<result>14</result>