There are two groups of students in the sixth grade. There are 45 students in group A, and 55 students in group B. If, on a particular day, 20% of the students in group A forget their homework, and 40% of the students in group B forget their homework, then what percentage of the sixth graders forgot their homework?  Choose the most appropriate option:
A) 23%	B) 25%	C) 29%	D) 31%	E) 36%
Number of students in group A = 45   students who forget homework in group A = 20 % of 45 = 9 students   Number of students in group B = 55   students who forget homework in group B = 40 % of 55 = 22 students   Total number of students = 45 + 55= 
<gadget id="calculator">45 + 55</gadget>
<output>100</output>
100   students who forgot homework= 9 + 22= 
<gadget id="calculator">9 + 22</gadget>
<output>31</output>
31 students   percentage of students who forget homework= 31/100 * 100= 
<gadget id="calculator">31/100 * 100</gadget>
<output>31</output>
31%   Answer: 31%
<result>D</result>
There are two groups of students in the sixth grade. There are 45 students in group A, and 55 students in group B. If, on a particular day, 20% of the students in group A forget their homework, and 40% of the students in group B forget their homework, then what percentage of the sixth graders forgot their homework?