To find the percent error of Layla's prediction, we use the formula for percent error:
\[ \text{Percent Error} = \left| \frac{\text{Actual Value} - \text{Predicted Value}}{\text{Actual Value}} \right| \times 100 \]
In this case, the actual value (full capacity of the stadium) is 81,500 seats, and Layla's predicted value is 79,000 seats.
Substituting the values into the formula:
\[ \text{Percent Error} = \left| \frac{81,500 - 79,000}{81,500} \right| \times 100 \]
Calculating the numerator:
\[ 81,500 - 79,000 = 2,500 \]
Now divide by the actual value:
\[ \frac{2,500}{81,500} \approx 0.0307 \]
Now multiply by 100 to convert to a percentage:
\[ 0.0307 \times 100 \approx 3.07% \]
Thus, the percent error of Layla's prediction is approximately 3.07%.
Therefore, the correct response is:
3.07%