Xiao Wang's father bought a three-year national bond of 3,000 yuan. The annual interest rate of this national bond is 4.5%. After the maturity, how much money can Xiao Wang's father get back in total?
小王的爸爸买了三年期的3000元国债券，这种国债券的年利率是4.5%，到期后，小王的爸爸一共可以取回多少元？
<gadget id="calculator">4.5 / 100</gadget>
<output>0.045</output>

<gadget id="calculator">3_000 * 0.045 * 3</gadget>
<output>405</output>

<gadget id="calculator">3_000 + 405</gadget>
<output>3_405</output>

<result>3_405</result>