For a piece of clothing, the price is first reduced by 10%, and then the price is reduced by 10%. After the two price reductions, how much is it lower than the original price?
一件衣服，先降价10%，之后又降价10%，两次降价后比原来降低了多少
<gadget id="calculator">10 / 100</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">(9/10) * (9/10)</gadget>
<output>81/100 = around 0.81</output>

<gadget id="calculator">1 - (81/100)</gadget>
<output>19/100 = around 0.19</output>

<result>19/100 = around 0.19</result>