A product is 200 yuan, the price is reduced by 20% for the first time, and then the price is reduced by 20%, how much is the price at this time?
一件商品200元，第一次降价20%接着又降价20%，这时的价格是多少元？
<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">200 * (4/5) * (4/5)</gadget>
<output>128</output>

<result>128</result>