The original price of a piece of clothing is 120 yuan. If you buy it after a 20% discount, how much money you can save.
一件衣服原价120元，打八折后去买，可省多少元钱．
<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">120 * (1/5)</gadget>
<output>24</output>

<result>24</result>