Grandpa Wang deposited 5,000 yuan in the bank for a period of 3 years. If the annual interest rate is 2.89%, what is the total amount of principal and after-tax interest he can get when it matures? (Interest tax 20%)
王爷爷将5000元存入银行，定期3年．如果年利率是2.89%，到期时他可以获得本金和税后利息一共多少元？(利息税20%)
<gadget id="calculator">2.89 / 100</gadget>
<output>0.0289</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_000 * 0.0289 * 3 * (4/5)</gadget>
<output>346.8</output>

<gadget id="calculator">346.8 + 5_000</gadget>
<output>5_346.8</output>

<result>5_346.8</result>