After increasing (1/10) 20 tons, then decreasing (1/10), what is the result?
20吨增加(1/10)后，再减少(1/10)，结果是多少．
<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">20 * (11/10)</gadget>
<output>22</output>

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

<gadget id="calculator">22 * (9/10)</gadget>
<output>99/5 = around 19.8</output>

<result>99/5 = around 19.8</result>