Last year's "Six Day" Children's Day, the sixth grade students donated 2,200 yuan and deposited the money in the bank for one year. If the annual interest rate is 2.25%, they will donate the principal and interest together to the children in poor mountainous areas after maturity. How much can you donate?
去年"六一"儿童节时，六年级同学捐款2200元，将钱存入银行定期一年，如果年利率是2.25%，到期后他们将本金和利息一起捐给贫困山区的小朋友，他们可以捐款多少元？
<gadget id="calculator">2.25 / 100</gadget>
<output>0.0225</output>

<gadget id="calculator">2_200 * 0.0225 * 1</gadget>
<output>49.5</output>

<gadget id="calculator">2_200 + 49.5</gadget>
<output>2_249.5</output>

<result>2_249.5</result>