The original price of a product is 100 yuan per piece. After the price is reduced by 10%, the price is increased by 10%. What is the current price of each piece?
某产品原价每件100元，降价10%后，再涨价10%，现在每件的售价是多少元．
<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">1 + (1/10)</gadget>
<output>11/10 = around 1.1</output>

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

<result>99</result>