Zhao Qun deposited 500 yuan in the bank on October 1, 1999, for two years. If the annual interest rate is 2.43%, how much yuan can he withdraw the principal and after-tax interest when he withdraws it on October 1, 2001?
赵群1999年10月1日把500元钱存入银行，定期两年，如果年利率是2.43%，到2001年10月1日取出时，他可以取出本金和税后利息多少元？
<gadget id="calculator">2.43 / 100</gadget>
<output>0.0243</output>

<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 - (1/5)</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">500 * 0.0243 * 2 * (4/5)</gadget>
<output>19.44</output>

<gadget id="calculator">500 + 19.44</gadget>
<output>519.44</output>

<result>519.44</result>