Aunt Zhang bought 20,000 yuan of five-year national construction bonds with an annual interest rate of 3.81%. How much can she get back the principal and interest at maturity?
张大妈买了20000元五年期的国家建设债券，年利率是3.81%．到期时她可以取回本金和利息一共多少元？
<gadget id="calculator">3.81 / 100</gadget>
<output>0.0381</output>

<gadget id="calculator">20_000 * 0.0381 * 5</gadget>
<output>3_810</output>

<gadget id="calculator">20_000 + 3_810</gadget>
<output>23_810</output>

<result>23_810</result>