Mingming's mother deposited 5,600 yuan in the bank for three years, with an annual interest rate of 6.75%. How much is the total amount of principal and after-tax interest received after maturity?
明明妈妈把5600元钱存入银行三年，年利率为6.75%．到期后获本金和税后利息共多少元？
<gadget id="calculator">6.75 / 100</gadget>
<output>0.0675</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">5_600 * 0.0675 * 3 * (4/5)</gadget>
<output>907.2</output>

<gadget id="calculator">5_600 + 907.2</gadget>
<output>6_507.2</output>

<result>6_507.2</result>