Uncle Wang bought 40,000 yuan of national construction vouchers, fixed for 3 years, and the annual interest rate is 3.15%. How much money can he get when it expires?
王叔叔买了40000元国家建设劵，定期3年，年利率是3.15%，到期时，他可以拿到多少钱？
<gadget id="calculator">3.15 / 100</gadget>
<output>0.0315</output>

<gadget id="calculator">40_000 * 0.0315 * 3</gadget>
<output>3_780</output>

<gadget id="calculator">40_000 + 3_780</gadget>
<output>43_780</output>

<result>43_780</result>