The original price of a certain stock is 100 yuan. It rose by 10% on the first day and fell by 10% on the second day. What is the current price?
某股票原价100元，第一天上涨了10%，第二天下跌了10%，现价多少元．
<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 - (1/10)</gadget>
<output>9/10 = around 0.9</output>

<gadget id="calculator">100 * (11/10) * (9/10)</gadget>
<output>99</output>

<result>99</result>