To find the percentage decrease in the number of people who went to the beach, you can use the following formula:
\[ \text{Percentage decrease} = \left( \frac{\text{Last week's attendance} - \text{This week's attendance}}{\text{Last week's attendance}} \right) \times 100 \]
Plugging in the numbers from your question:
- Last week's attendance = 1,211
- This week's attendance = 971
Now, calculate the decrease in attendance:
\[ \text{Decrease} = 1,211 - 971 = 240 \]
Now plug this value into the percentage decrease formula:
\[ \text{Percentage decrease} = \left( \frac{240}{1,211} \right) \times 100 \]
Calculating:
\[ \text{Percentage decrease} \approx 0.1976 \times 100 \approx 19.76 \]
Therefore, the number of people who went to the beach fell by approximately 19.76%.