Mr. Zhao deposits 3,000 yuan in the bank for 2 years, with an annual interest rate of 4.5%. How much is the principal and after-tax interest in total?
赵老师把3000元存入银行，定期2年，年利率是4.5%，到期时可得本金和税后利息一共多少元？
<gadget id="calculator">4.5 / 100</gadget>
<output>0.045</output>

<gadget id="calculator">3_000 * 0.045 * 2</gadget>
<output>270</output>

<gadget id="calculator">3_000 + 270</gadget>
<output>3_270</output>

<result>3_270</result>