To find out how many people who are 40 or younger have no opinion, we need to look at the age groups of 21–30 and 31–40 since those are the groups included in "40 or younger."
From the table, we see:
- For the age group 21–30, the number of people with no opinion is 18.
- For the age group 31–40, the number of people with no opinion is 25.
Now, we add these two values together:
18 (no opinion in 21–30) + 25 (no opinion in 31–40) = 43.
Therefore, the number of people who are 40 or younger and have no opinion is 43.