Fang Fang deposits 500 yuan in the bank, deposits and withdraws in lump sum for 1 year, and the annual interest rate is 1.98%.
方方将500元存入银行，存整存整取1年，年利率是1.98%，到期时方方可得本金和税后利息一共多少元？
<gadget id="calculator">1.98 / 100</gadget>
<output>0.0198</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 * 0.0198 * 1 * (4/5)</gadget>
<output>7.92</output>

<gadget id="calculator">500 + 7.92</gadget>
<output>507.92</output>

<result>507.92</result>