Deposit 500 yuan in the bank with a deposit period of one year and an annual interest rate of 2.25%. How much after-tax interest can you get after maturity? (Interest tax is calculated at 20%)
把500元存入银行，存期一年，年利率2.25%，到期后可得到税后利息多少元？(利息税按20%计算)
<gadget id="calculator">2.25 / 100</gadget>
<output>0.0225</output>

<gadget id="calculator">500 * 0.0225 * 1</gadget>
<output>11.25</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">11.25 * (4/5)</gadget>
<output>9</output>

<result>9</result>