In June 2015, Congcong deposited 500 yuan of pocket money in the bank for a period of two years. After the maturity, he could get a total of 544 yuan in principal and interest. Do you know what the annual interest rate is for this kind of fixed period?
2015年6月，聪聪把500元零花钱存入银行，定期两年，到期后可得本金和利息共544元，你知道这种定期的年利率是多少吗？
<gadget id="calculator">544 - 500</gadget>
<output>44</output>

<gadget id="calculator">44 / 500 / 2</gadget>
<output>11/250 = around 0.044</output>

<result>11/250 = around 0.044</result>