The price of a commodity is reduced for the first time (1/10), and the price is reduced again for the second time (1/10). What fraction of the original price is the current price?
一件商品第一次降价(1/10)，第二次又降价(1/10)，现价是原价的几分之几？
<gadget id="calculator">1 / 10</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">1 - (1/10)</gadget>
<output>9/10 = around 0.9</output>

<gadget id="calculator">1 * (9/10) * (9/10)</gadget>
<output>81/100 = around 0.81</output>

<result>81/100 = around 0.81</result>