A person deposits 2,000 yuan in the bank for two years, with an annual interest rate of 2.25%. After paying the 20% interest tax at maturity, how much is the after-tax interest?
某人将2000元存入银行，定期两年，年利率2.25%，到期交了20%的利息税后，可得税后利息多少元．
<gadget id="calculator">2.25 / 100</gadget>
<output>0.0225</output>

<gadget id="calculator">2_000 * 0.0225 * 2</gadget>
<output>90</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">90 * (4/5)</gadget>
<output>72</output>

<result>72</result>