Grandma bought 12,000 yuan of national bonds, fixed for 3 years, and the annual interest rate is 5.71%. How much is the total principal and interest when it matures? (excluding interest tax)
奶奶买了12000元的国债券，定期3年，年利率是5.71%，到期时本金和利息一共多少元？(不计利息税)
<gadget id="calculator">5.71 / 100</gadget>
<output>0.0571</output>

<gadget id="calculator">12_000 * 0.0571 * 3</gadget>
<output>2_055.6</output>

<gadget id="calculator">12_000 + 2_055.6</gadget>
<output>14_055.6</output>

<result>14_055.6</result>