The original price of a commodity is 100 yuan, the price is reduced by 20% for the first time, and then the price is increased by 20%, what is the current price of this commodity.
一种商品原价是100元，第一次降价是20%，接着又涨价20%，这种商品现在的价格是多少元．
<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>

<gadget id="calculator">1 + (1/5)</gadget>
<output>6/5 = around 1.2</output>

<gadget id="calculator">100 * (4/5) * (6/5)</gadget>
<output>96</output>

<result>96</result>