To find the percent increase in production, you can use the formula:
\[ \text{Percent Increase} = \left( \frac{\text{New Value} - \text{Old Value}}{\text{Old Value}} \right) \times 100 \]
In this case:
- Old Value (last year's production) = 129,000
- New Value (this year's production) = 141,000
Now, plug in the values:
\[ \text{Percent Increase} = \left( \frac{141,000 - 129,000}{129,000} \right) \times 100 \]
\[ \text{Percent Increase} = \left( \frac{12,000}{129,000} \right) \times 100 \]
\[ \text{Percent Increase} \approx 0.09302326 \times 100 \]
\[ \text{Percent Increase} \approx 9.30% \]
Therefore, the percent of increase in production is approximately 9.30%.