The original price of a commodity is 100 yuan, the price is first increased (1/10), and then the price is reduced (1/10), what is the current price of this commodity?
一种商品原价100元，先提价(1/10)，又降价(1/10)，这种商品现价多少元？
<gadget id="calculator">1 / 10</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>