Mr. Wang deposits 3,000 yuan in the bank for 2 years, the annual interest rate is calculated at 2.25%, and the interest tax is charged at 5% of the interest. How much is the total 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，再按利息的5%上利息税，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">5 / 100</gadget>
<output>1/20 = around 0.05</output>

<gadget id="calculator">1 - (1/20)</gadget>
<output>19/20 = around 0.95</output>

<gadget id="calculator">3_000 * 2 * 0.0225 * (19/20)</gadget>
<output>128.25</output>

<gadget id="calculator">128.25 + 3_000</gadget>
<output>3_128.25</output>

<result>3_128.25</result>