If the average price of a commodity has been raised by 10% in October, dropped by 10% in November, and then increased by 10% in December, how much has the average price of this commodity increased from the original price to the end of December
某种商品的平均价格在10月份上调了10%，11月份下降了10%，12月份又上调了10%，则这种商品从原价到12月底的平均价格上升了多少
<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">1 * (11/10)</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">(11/10) * (9/10)</gadget>
<output>99/100 = around 0.99</output>

<gadget id="calculator">(99/100) * (11/10)</gadget>
<output>1_089/1_000 = around 1.089</output>

<gadget id="calculator">(1_089/1_000) - 1</gadget>
<output>89/1_000 = around 0.089</output>

<gadget id="calculator">(89/1_000) / 1</gadget>
<output>89/1_000 = around 0.089</output>

<result>89/1_000 = around 0.089</result>