Mom deposits 10,000 yuan in the bank for one year, with an annual interest rate of 2.25% interest and 20% tax. After maturity, how much can mother get back the principal and after-tax interest?
妈妈在银行存款10000元，定期一年，年利率是2.25%利息税20%，到期后，妈妈能取回本金和税后利息共多少元？
<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">10_000 * 0.0225 * 1 * (4/5)</gadget>
<output>180</output>

<gadget id="calculator">10_000 + 180</gadget>
<output>10_180</output>

<result>10_180</result>