Xiaohua deposits the accumulated pocket money of 200 yuan in the bank on January 1 this year for three years on a regular basis. Donate the interest to "Hope Project" after the preparation expires. If the annual interest rate is calculated at 2.70%, and the interest tax is 20%, how much interest can be earned at maturity? (20% interest tax means 20% of interest is national tax and needs to be paid)
小华今年以1月1日把积攒的200元零用钱存入银行，定期三年．准备到期后把利息捐赠给"希望工程"．如果年利率按2.70%计算，且利息税为20%，到期可获得利息多少元？(20%的利息税即利息的20%是国税，需上缴)
<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">200 * 0.027 * 3 * (4/5)</gadget>
<output>12.96</output>

<result>12.96</result>