If 100 yuan is increased by (1/10) and then decreased by (1/10) yuan, what is the result?
100元增加它的(1/10)，再减少(1/10)元，结果是多少．
<gadget id="calculator">1 / 10</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">100 * (1/10)</gadget>
<output>10</output>

<gadget id="calculator">10 - (1/10)</gadget>
<output>99/10 = around 9.9</output>

<gadget id="calculator">100 + (99/10)</gadget>
<output>1_099/10 = around 109.9</output>

<result>1_099/10 = around 109.9</result>