Uncle Wang bought 30,000 yuan of treasury bonds, fixed for one year, and the annual interest rate is 3.15%. After the maturity, how much yuan can Uncle Wang get back?
王叔叔买了30000元国债，定期一年，年利率是3.15%，到期后，王叔叔可以拿回多少元？
<gadget id="calculator">3.15 / 100</gadget>
<output>0.0315</output>

<gadget id="calculator">30_000 * 0.0315 * 1</gadget>
<output>945</output>

<gadget id="calculator">30_000 + 945</gadget>
<output>30_945</output>

<result>30_945</result>