Uncle Wang deposits 10,000 yuan in the bank with an annual interest rate of 3.5%. After three years, Uncle Wang can withdraw the principal and after-tax interest from the bank in total.
王叔叔将10000元存进银行，年利率是3.5%，三年后王叔叔可从银行取出本金和税后利息一共多少元．
<gadget id="calculator">3.5 / 100</gadget>
<output>0.035</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">10_000 * 0.035 * 3 * (4/5)</gadget>
<output>840</output>

<gadget id="calculator">10_000 + 840</gadget>
<output>10_840</output>

<result>10_840</result>