Grandma’s hearing loss, Fangfang plans to use the lucky money she deposited in the bank to buy a hearing aid for grandma. She deposited 800 yuan on June 1, 2001, and made regular lump sum deposits and withdrawals for 3 years. The annual interest rate was 2.70%. How much is the total amount of principal and after-tax interest she can withdraw after the period?
奶奶听力下降，芳芳打算用自己存入银行的压岁钱给奶奶买一个助听器，她在2001年的6月1日存入800元钱，定期整存整取3年，年利率是2.70%，到期后她可以取出本金和税后利息一共多少元？
<gadget id="calculator">2.7 / 100</gadget>
<output>0.027</output>

<gadget id="calculator">800 * 0.027 * 3</gadget>
<output>64.8</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">64.8 * (4/5)</gadget>
<output>51.84</output>

<gadget id="calculator">800 + 51.84</gadget>
<output>851.84</output>

<result>851.84</result>