Xiaoli deposits 500 yuan of New Year's money in the bank, and deposits and withdraws it as a whole for one year. The annual interest rate is 2.25%, and the interest tax rate is 20%. How much after-tax interest can she get after maturity?
小丽将500元压岁钱存人银行，整存整取一年，年利率为2.25%，利息税率20%，到期后可得税后利息多少元？
<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>