Uncle Li bought 20,000 yuan of government bonds, fixed for 3 years, with an annual interest rate of 2.7%. How much principal and interest should Uncle Li get after maturity?
李叔叔购买20000元国债，定期3年，年利率是2.7%，到期后李叔叔应得本息多少元？
<gadget id="calculator">2.7 / 100</gadget>
<output>0.027</output>

<gadget id="calculator">20_000 * 0.027 * 3</gadget>
<output>1_620</output>

<gadget id="calculator">20_000 + 1_620</gadget>
<output>21_620</output>

<result>21_620</result>