Xiaoqing's mother bought a two-year bond with an annual interest rate of 3.5% for 3,000 yuan. How much is the total principal and interest after two years?
小青妈妈买了年利率为3.5%的两年期债券3000元，两年后应得本息共多少元？
<gadget id="calculator">3.5 / 100</gadget>
<output>0.035</output>

<gadget id="calculator">3_000 * 0.035 * 2</gadget>
<output>210</output>

<gadget id="calculator">210 + 3_000</gadget>
<output>3_210</output>

<result>3_210</result>