Li Liang bought 1,000 yuan of national construction bonds with a fixed term of 2 years. After the maturity, he will get 57.8 yuan of interest. What is the annual interest rate of this construction bond?
李亮买了1000元的国家建设债券，定期2年，到期后，他得到57.8元的利息，这种建设债券年利率是多少．
<gadget id="calculator">57.8 / 1_000 / 2</gadget>
<output>0.0289</output>

<result>0.0289</result>