Li Ming deposits 500 yuan of New Year's money in the bank, deposits and withdraws for two years, the annual interest rate is 2.78%, how much yuan will be withdrawn when it matures.
李明把500元压岁钱存入银行，整存整取二年，年利率为2.78%，到期时共取回多少元．
<gadget id="calculator">2.78 / 100</gadget>
<output>0.0278</output>

<gadget id="calculator">500 * 0.0278 * 2</gadget>
<output>27.8</output>

<gadget id="calculator">500 + 27.8</gadget>
<output>527.8</output>

<result>527.8</result>