A piece of clothing is priced at 121 yuan after a 10% price increase. How much is the price increase for this piece of clothing?
一件衣服涨价10%后售价为121元，这件衣服比原来涨价多少元？
<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">121 / (11/10)</gadget>
<output>110</output>

<gadget id="calculator">110 * (1/10)</gadget>
<output>11</output>

<result>11</result>