The original price of a commodity is 100 yuan, and the price is increased by 10% and then reduced by 10%, what is the current price?
某种商品原价为100元，涨价10%后又降价10%，现价为多少元？
<gadget id="calculator">90 / 100</gadget>
<output>9/10 = around 0.9</output>

<gadget id="calculator">110 * (9/10)</gadget>
<output>99</output>

<result>99</result>