Mom deposits 5,000 yuan in the bank for 3 years, and the annual interest rate is 3.96%. After the maturity, how much is the principal and after-tax interest that mother can get.
妈妈将5000元存入银行，定期3年，年利率是3.96%，到期后妈妈可得本金和税后利息共多少元．
<gadget id="calculator">3.96 / 100</gadget>
<output>0.0396</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 * 0.0396 * 3 * (4/5)</gadget>
<output>475.2</output>

<gadget id="calculator">5_000 + 475.2</gadget>
<output>5_475.2</output>

<result>5_475.2</result>