Li Gang deposits 800 yuan in the bank for a period of three years, with an annual interest rate of 2.7%. How much is the after-tax interest when it matures? (The tax rate is calculated at 20%)
李刚把800元钱存入银行，定期三年，年利率2.7%，到期时税后实得利息多少元？(税率按20%计算)
<gadget id="calculator">2.7 / 100</gadget>
<output>0.027</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">800 * 0.027 * 3 * (4/5)</gadget>
<output>51.84</output>

<result>51.84</result>