Dad deposits 20,000 yuan in a three-year time deposit in the bank, with an annual interest rate of 2.7%. If the 20% interest tax is deducted, how much after-tax interest can he get when it matures?
爸爸到银行存入三年定期存款20000元，年利率2.7%，如果扣除20%的利息税，到期时可得税后利息多少元？
<gadget id="calculator">2.7 / 100</gadget>
<output>0.027</output>

<gadget id="calculator">20_000 * 0.027 * 3</gadget>
<output>1_620</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_620 * (4/5)</gadget>
<output>1_296</output>

<result>1_296</result>