Aunt Liu bought 5,000 yuan of national bonds with an annual interest rate of 5.40%. How much will the principal and interest get back when it matures in three years?
刘大妈买了5000元国家债券，年利率是5.40%，三年到期时可取回本金和利息共多少钱？
<gadget id="calculator">5.4 / 100</gadget>
<output>0.054</output>

<gadget id="calculator">5_000 * 0.054 * 3</gadget>
<output>810</output>

<gadget id="calculator">5_000 + 810</gadget>
<output>5_810</output>

<result>5_810</result>