Xiaoxiao deposits 500 yuan of New Year's money in the bank, and deposits and withdraws for one year. She plans to donate all the principal and interest to the Hope Project after the maturity date. If the annual interest rate is 2.5%, how much can she donate after maturity?
笑笑把500元压岁钱存入银行，整存整取一年．她准备到期后将本息都捐给希望工程．如果按年利率2.5%计算，到期后她可以捐多少元．
<gadget id="calculator">2.5 / 100</gadget>
<output>0.025</output>

<gadget id="calculator">500 * 0.025 * 1</gadget>
<output>12.5</output>

<gadget id="calculator">500 + 12.5</gadget>
<output>512.5</output>

<result>512.5</result>