A shareholder buys 500 shares of a certain stock at 10 yuan per share. One day later, he sold all of them. After deducting the handling fee of 11 yuan, he made a net profit of 489 yuan. What is the increase of the stock on this day?
一股民买进某股票500股，每股10元．一天后他全部卖出，扣除手续费11元，净赚489元，则这一天该股票的涨幅是多少．
<gadget id="calculator">489 + 11</gadget>
<output>500</output>

<gadget id="calculator">500 * 10</gadget>
<output>5_000</output>

<gadget id="calculator">500 / 5_000</gadget>
<output>1/10 = around 0.1</output>

<result>1/10 = around 0.1</result>