The People's Bank of China stipulates that the annual interest rate for two-year lump sum deposits and withdrawals is 2.25%. Li Ping deposits 1,000 yuan today, with a fixed term of two years. After maturity, in addition to the principal, how much is the after-tax interest he will get.
中国人民银行规定：两年期整存整取存款的年利率为2.25%．李平今天存入1000元，定期两年．到期后，除本金外，他得到的税后利息是多少元．
<gadget id="calculator">2.25 / 100</gadget>
<output>0.0225</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">1_000 * 2 * 0.0225 * (4/5)</gadget>
<output>36</output>

<result>36</result>