Teacher Li bought 20,000 yuan of three-year treasury bonds with an annual interest rate of 5%. After the maturity, how much interest can Teacher Li get? (Note: Treasury bonds do not pay interest tax)
李老师买了三年期的国债2万元，年利率是5%，到期后，李老师能得到多少元利息．(注：国债不交利息税)
<gadget id="calculator">2 * 10_000</gadget>
<output>20_000</output>

<gadget id="calculator">5 / 100</gadget>
<output>1/20 = around 0.05</output>

<gadget id="calculator">20_000 * (1/20) * 3</gadget>
<output>3_000</output>

<result>3_000</result>