A TV, the original price is 5600 yuan, the shopping mall is promoting, 20% off sale, how much cheaper is the current price than the original price.
一台电视机，原价5600元，商场搞促销，八折销售，现价比原价便宜多少元．
<gadget id="calculator">80 / 100</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">5_600 * (4/5)</gadget>
<output>4_480</output>

<gadget id="calculator">5_600 - 4_480</gadget>
<output>1_120</output>

<result>1_120</result>