The price of a batch of goods is reduced by 20% for the first time and 20% for the second time. How much is the price of this batch of goods lower than the original price?
一批货物，第一次降价20%，第二次降价20%，这批货物的价格比原来降低多少
<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>

<gadget id="calculator">(4/5) * (4/5)</gadget>
<output>16/25 = around 0.64</output>

<gadget id="calculator">1 - (16/25)</gadget>
<output>9/25 = around 0.36</output>

<result>9/25 = around 0.36</result>