Xiaohong deposits 100 yuan in the bank for 3 years, and the annual interest rate is 3.24%. How much is the total amount of principal and after-tax interest that Xiaohong can get at maturity.
小红把100元钱存入银行，存整存整取3年，年利率是3.24%．到期时小红可得本金和税后利息一共多少元．
<gadget id="calculator">3.24 / 100</gadget>
<output>0.0324</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">100 * 0.0324 * 3 * (4/5)</gadget>
<output>7.776</output>

<gadget id="calculator">100 + 7.776</gadget>
<output>107.776</output>

<result>107.776</result>