Mr. Li bought 40,000 yuan of three-year treasury bonds with an annual interest rate of 5.4%. After the maturity, how much principal and interest can Mr. Li get?
李老师买了三年期国债4万元，年利率5.4%，到期后，李老师能得到多少元的本金和利息．
<gadget id="calculator">5.4 / 100</gadget>
<output>0.054</output>

<gadget id="calculator">40_000 * 0.054 * 3</gadget>
<output>6_480</output>

<gadget id="calculator">40_000 + 6_480</gadget>
<output>46_480</output>

<result>46_480</result>