Aunt Wang bought a 3-year national construction bond of 30,000 yuan, with an annual interest rate of 4%. After the maturity date, she will receive a total of 30,000 yuan in principal and interest.
王阿姨买了3年期的国家建设债券3万元，年利率是4%，到期后，她可获本金和利息共多少元．
<gadget id="calculator">3 * 10_000</gadget>
<output>30_000</output>

<gadget id="calculator">4 / 100</gadget>
<output>1/25 = around 0.04</output>

<gadget id="calculator">30_000 * (1/25) * 3</gadget>
<output>3_600</output>

<gadget id="calculator">30_000 + 3_600</gadget>
<output>33_600</output>

<result>33_600</result>