Deposit Xiaodong's 500 yuan lucky money for three years on a fixed-term basis, and the annual interest rate for the three-year fixed-term deposit is 5.22%. How much money can you get back the principal and interest after maturity?
把小东的500元压岁钱存三年定期，三年定期的年利率为5.22%．到期后可取回本息多少元钱．
<gadget id="calculator">5.22 / 100</gadget>
<output>0.0522</output>

<gadget id="calculator">500 * 0.0522 * 3</gadget>
<output>78.3</output>

<gadget id="calculator">500 + 78.3</gadget>
<output>578.3</output>

<result>578.3</result>