Wang Ping's family bought 500 yuan of construction bonds, fixed for three years. If the annual interest rate of construction bonds is 2.89%, how much is the total principal and interest at maturity?
王平家买了500元建设债券，定期三年．如果建设债券的年利率是2.89%，到期时本金和利息一共是多少元？
<gadget id="calculator">2.89 / 100</gadget>
<output>0.0289</output>

<gadget id="calculator">500 * 0.0289 * 3</gadget>
<output>43.35</output>

<gadget id="calculator">500 + 43.35</gadget>
<output>543.35</output>

<result>543.35</result>