Mom deposits 1,000 yuan in the bank, and deposits and withdraws in lump sum for 3 years, with an annual interest rate of 2.70%. When the maturity expires, mother can get back the total amount of principal and after-tax interest. (Interest tax rate is 20%)
妈妈把1000元钱存入银行，整存整取3年，年利率2.70%，到期时妈妈可以取回本金和税后利息一共多少元．(利息税率为20%)
<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">1_000 * 0.027 * 3 * (4/5)</gadget>
<output>64.8</output>

<gadget id="calculator">1_000 + 64.8</gadget>
<output>1_064.8</output>

<result>1_064.8</result>