10 kilograms of items are increased by 10% and then decreased by 10%, what is the result in kilograms
10千克的物品增加10%后，再减少10%，结果是多少千克
<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">10 * (11/10)</gadget>
<output>11</output>

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

<gadget id="calculator">11 * (9/10)</gadget>
<output>99/10 = around 9.9</output>

<result>99/10 = around 9.9</result>