Uncle Li deposited 5,000 yuan in the bank for a period of two years, with an annual interest rate of 2.25%. How much will he get for the principal and after-tax interest when it matures?
李大伯把5000元存入银行，定期二年，年利率是2.25%，到期可获本金和税后利息多少元．
<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">5_000 * 0.0225 * 2 * (4/5)</gadget>
<output>180</output>

<gadget id="calculator">5_000 + 180</gadget>
<output>5_180</output>

<result>5_180</result>