There is a discount in the shopping mall. The trousers whose original price is 120 yuan are sold at a 20% discount. How much is the price cut?
商场打折，原价是120元的裤子八折出售，降价多少元．
<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">120 * (1/5)</gadget>
<output>24</output>

<result>24</result>