Uncle Zhang deposits 2,000 yuan in the bank for 2 years, the annual interest rate is 2.25%, and he needs to pay 20% interest tax when it matures. Find out how much after tax Uncle Zhang can get after the maturity.
张大爷把2000元存入银行，定期2年，年利率是2.25%，到期需支付20%的利息税，求到期后张大爷可以拿到税后利息多少元．
<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">2_000 * 0.0225 * 2 * (4/5)</gadget>
<output>72</output>

<result>72</result>