On June 1, 2004, Dad bought treasury bonds with 5,000 yuan. The term is fixed for three years, and the annual interest rate is 2.87%. How much can Dad get back the principal and interest when it expires?
爸爸2004年6月1日用5000元钱购买了国库券，定期三年，年利率为2.87%，到期时爸爸可取回本金和利息多少元？
<gadget id="calculator">2.87 / 100</gadget>
<output>0.0287</output>

<gadget id="calculator">5_000 * 0.0287 * 3</gadget>
<output>430.5</output>

<gadget id="calculator">5_000 + 430.5</gadget>
<output>5_430.5</output>

<result>5_430.5</result>