Li Shuang deposits the 500 yuan given by his grandfather in the bank for two years on a regular basis, with an annual interest rate of 2.43%. After two years, Li Shuang has to pay interest tax at 20% when depositing. How much should Li Shuang get back after the maturity date?
李双将爷爷给的500元存入银行，定期2年，年利率是2.43%，两年后李双存款时要按20%缴纳利息税，到期后李双应取回多少元？
<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>