Grandpa Zhang deposited 6,000 yuan in the bank for a period of 5 years, with an annual interest rate of 4.75%, and the interest on the deposit was taxed at a rate of 20%. How much after-tax interest and principal can grandpa zhang get when it is due?
张爷爷把6000元存入银行，为期5年，年利率是4.75%，存款的利息按20%的税率纳税．到期时，张爷爷可得税后利息和本金一共多少元？
<gadget id="calculator">4.75 / 100</gadget>
<output>0.0475</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">6_000 * 0.0475 * 5 * (4/5)</gadget>
<output>1_140</output>

<gadget id="calculator">6_000 + 1_140</gadget>
<output>7_140</output>

<result>7_140</result>