Uncle Li deposits 25,000 yuan in the bank for a fixed period of one year. If the annual interest rate is 2.25%, how much after-tax interest can he get when it matures?
李叔叔把25000元钱存入银行，定期一年，如果年利率是2.25%，到期时可得税后利息多少元？
<gadget id="calculator">2.25 / 100</gadget>
<output>0.0225</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">25_000 * 0.0225 * 1 * (4/5)</gadget>
<output>450</output>

<result>450</result>