The price of a commodity is increased (1/10) and then decreased (1/10). Is there any change in the current price compared with the original price? If so, is it more, or less, and why?
一种商品先提价(1/10)后，又降价(1/10)，现价与原价比较，有没有变化？如果有，是多了，还是少了，为什么？
<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">1 * (11/10) * (9/10)</gadget>
<output>99/100 = around 0.99</output>

<gadget id="calculator">1 - (99/100)</gadget>
<output>1/100 = around 0.01</output>

<result>1/100 = around 0.01</result>