The original price of a kind of electrical appliance is 120 yuan, and Xinfeng Shopping Mall will give you a 20% discount during the "May 1st" period. How much is it cheaper?
一种电器原价120元，新风商场"五一"期间打八折促销，便宜了多少元．
<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>