Jiajia's father bought a three-year national bond of 12,000 yuan in the bank, with an annual interest rate of 3.14%. How much is the principal and interest that can be withdrawn after three years?
佳佳的爸爸在银行买了三年期的国债12000元，年利率为3.14%．三年后一共可取本金和利息多少元？
<gadget id="calculator">3.14 / 100</gadget>
<output>0.0314</output>

<gadget id="calculator">12_000 * 0.0314 * 3</gadget>
<output>1_130.4</output>

<gadget id="calculator">12_000 + 1_130.4</gadget>
<output>13_130.4</output>

<result>13_130.4</result>