The original price of a commodity is 100 yuan. Due to market reasons, the price is first raised by 10%, and then reduced by 10%. What is the current price of this commodity?
一种商品原来售价是100元，因市场原因，先提价10%，后来降低10%，这种商品现在的价格是多少元．
<gadget id="calculator">10 / 100</gadget>
<output>1/10 = around 0.1</output>

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

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

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

<result>99</result>