The annual interest rate of the three-year treasury bond is 5.5%. If someone buys a treasury bond of 30,000 yuan, how much will it be with the principal and interest when it matures?
三年期国债的年利率是5.5%，某人购买国债30000元，到期连本带息是多少元．
<gadget id="calculator">5.5 / 100</gadget>
<output>0.055</output>

<gadget id="calculator">30_000 * 0.055 * 3</gadget>
<output>4_950</output>

<gadget id="calculator">30_000 + 4_950</gadget>
<output>34_950</output>

<result>34_950</result>