During the New Year period, Parkson will hold promotional activities, and the price of a color TV will be reduced by 20%. The current price is equivalent to the original price.
新年期间百盛搞促销活动，一台彩电降价20%，现价相当于原价的多少．
<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 - (1/5)</gadget>
<output>4/5 = around 0.8</output>

<result>4/5 = around 0.8</result>