The original price of a commodity is 100 yuan. First reduce the price (1/10) and then raise the price (1/10). What is the current price of the commodity?
一种商品原价100元．先降价(1/10)后又提价(1/10)．现在的商品的价格是多少元？
<gadget id="calculator">1 / 10</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>