To find the percent error, you can use the following formula:
\[ \text{Percent Error} = \left( \frac{\text{Actual Value} - \text{Estimated Value}}{\text{Actual Value}} \right) \times 100 \]
In this case:
- Actual Value = 75 pounds (the true weight of the dog)
- Estimated Value = 60 pounds (what Angie believes the dog weighs)
Now, substituting the values into the formula:
\[ \text{Percent Error} = \left( \frac{75 - 60}{75} \right) \times 100 \]
\[ \text{Percent Error} = \left( \frac{15}{75} \right) \times 100 \]
\[ \text{Percent Error} = 0.2 \times 100 \]
\[ \text{Percent Error} = 20% \]
Therefore, the percent error is 20%.