Uncle Li bought a five-year national construction bond of 20,000 yuan with an annual interest rate of 3.81%. How much will she get back when it expires?
李叔叔买了五年期的国家建设债券2万元，年利率是3.81%，到期时，她共取回多少钱？
<gadget id="calculator">2 * 10_000</gadget>
<output>20_000</output>

<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>