Deposit 2,000 yuan in the bank for three years, with an annual interest rate of 3.24%. How much is the after-tax interest at maturity.
把2000元钱存入银行三年，年利率3.24%．到期可得税后利息多少元．
<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">2_000 * 0.0324 * 3 * (4/5)</gadget>
<output>155.52</output>

<result>155.52</result>