The price of a piece of clothing in a shopping mall increased by 10% in August compared to July, and decreased by 10% in September compared to August. How much is the price in September lower than in July?
某商场的一件衣服价格八月比七月涨10%，九月比八月降10%．九月的价格比七月降百分之几？
<gadget id="calculator">10 / 100</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">1 + (1/10)</gadget>
<output>11/10 = around 1.1</output>

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

<gadget id="calculator">(11/10) * (9/10)</gadget>
<output>99/100 = around 0.99</output>

<gadget id="calculator">1 - (99/100)</gadget>
<output>1/100 = around 0.01</output>

<result>1/100 = around 0.01</result>