A five-year national debt has an annual interest rate of 3.2%. Aunt Wang bought this kind of national debt for 40,000 yuan. How much interest can she get when it matures (interest tax is exempted).
一种五年期的国债年利率是3.2%王阿姨买了这种国债4万元，到期可得利息多少元(免交利息税)．
<gadget id="calculator">4 * 10_000</gadget>
<output>40_000</output>

<gadget id="calculator">3.2 / 100</gadget>
<output>0.032</output>

<gadget id="calculator">40_000 * 0.032 * 5</gadget>
<output>6_400</output>

<result>6_400</result>