Teacher Zhang bought a five-year national construction bond of 10,000 yuan, with an annual interest rate of 3.18%. When it is due, how much is Mr. Zhang's principal and interest?
张老师购买了五年期的国家建设债券10000元，年利息是3.18%．到期时，张老师的本金和利息共有多少元．
<gadget id="calculator">3.18 / 100</gadget>
<output>0.0318</output>

<gadget id="calculator">10_000 * 0.0318 * 5</gadget>
<output>1_590</output>

<gadget id="calculator">10_000 + 1_590</gadget>
<output>11_590</output>

<result>11_590</result>