Uncle Wang bought 4,000 yuan in three-year treasury bonds with an annual interest rate of 4.18%. How much interest can he get after maturity?
王叔叔购得三年期国库券4000元，年利率是4.18%，到期后可得利息多少元？
<gadget id="calculator">4.18 / 100</gadget>
<output>0.0418</output>

<gadget id="calculator">4_000 * 0.0418 * 3</gadget>
<output>501.6</output>

<result>501.6</result>