A small gift of 10 yuan, first reduce the price (1/10) and then increase the price (1/10), what is the result?
一件10元的小礼品，先降价(1/10)后再提价(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>9/10 = around 0.9</output>

<gadget id="calculator">1 + (1/10)</gadget>
<output>11/10 = around 1.1</output>

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

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