To find out how many shoppers were buying food for a week or more, you can multiply the total number of shoppers surveyed by the percentage of those buying food for a week or more.
Given:
- Total shoppers surveyed = 50
- Percentage buying food for a week or more = 40% = 0.40 (as a decimal)
Now, calculate the number of shoppers:
\[ \text{Number of shoppers} = 50 \times 0.40 = 20 \]
So, 20 shoppers were buying food for a week or more.