There are 100 kilograms of items, after increasing (1/10), and then reducing (1/10), what is the result in kilograms?
现有100千克的物品，增加它的(1/10)后，再减少(1/10)，结果重多少千克．
<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">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>