The teacher deposited 4,000 yuan in the bank in June this year for two years, with an annual interest rate of 2.25%. How much can he withdraw the principal and interest when it matures?
老师今年6月在银行存了4000元钱，定期二年，年利率为2.25%，到期时他可以取出本息共多少元？
<gadget id="calculator">2.25 / 100</gadget>
<output>0.0225</output>

<gadget id="calculator">4_000 * 0.0225 * 2</gadget>
<output>180</output>

<gadget id="calculator">4_000 + 180</gadget>
<output>4_180</output>

<result>4_180</result>