Now the annual interest rate of the three-year time deposit is 2.25%, and 20% of the interest tax must be paid when it matures. Dad deposits 1,000 yuan in the bank for a fixed period of three years.
现在三年定期存款年利率2.25%，到期还要缴纳20%的利息税，爸爸把1000元存入银行，定期3年，到期实得多少元利息．
<gadget id="calculator">2.25 / 100</gadget>
<output>0.0225</output>

<gadget id="calculator">1_000 * 3 * 0.0225</gadget>
<output>67.5</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">67.5 * (4/5)</gadget>
<output>54</output>

<result>54</result>