Mom bought 1,000 yuan of 3-year treasury bonds with an annual interest rate of 2.89%, and the total amount of principal and interest will be paid when it matures.
妈妈买了1000元3年期的国债券，年利率是2.89%，到期时共得到本金和利息多少元．
<gadget id="calculator">2.89 / 100</gadget>
<output>0.0289</output>

<gadget id="calculator">1_000 * 0.0289 * 3</gadget>
<output>86.7</output>

<gadget id="calculator">1_000 + 86.7</gadget>
<output>1_086.7</output>

<result>1_086.7</result>