In order to prepare for his child’s high school education expenses, a parent deposited 4,000 yuan in the bank on June 1, 2007, for a period of 3 years, with an annual interest rate of 2.85%. He can get the principal and after-tax interest when it matures How much is the total?
某家长为了给自己的孩子准备上高中学习费用，他在2007年6月1日存入4000元到银行，定期3年，年利率为2.85%，到期时他可以获得本金和税后利息共是多少元？
<gadget id="calculator">2.85 / 100</gadget>
<output>0.0285</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">4_000 * 0.0285 * 3 * (4/5)</gadget>
<output>273.6</output>

<gadget id="calculator">273.6 + 4_000</gadget>
<output>4_273.6</output>

<result>4_273.6</result>