Mr. Wang deposits 3,000 yuan in the bank for 2 years, and the annual interest rate is calculated at 2.25%. How much is the principal and after-tax interest?
王老师把3000元存入银行，定期2年，年利率按2.25%计算，到期可得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">3_000 * 0.0225 * 2 * (4/5)</gadget>
<output>108</output>

<gadget id="calculator">3_000 + 108</gadget>
<output>3_108</output>

<result>3_108</result>