If the original price of a commodity is 100 yuan per piece, and the price is increased by 10% and then the price is reduced by 10%, what is the current price of each piece?
某商品原价每件100元，涨价10%后再降价10%，那么它现在每件售价为多少元．
<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">100 * (11/10)</gadget>
<output>110</output>

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

<gadget id="calculator">110 * (9/10)</gadget>
<output>99</output>

<result>99</result>