To calculate the unemployment rate, you can use the following formula:
\[ \text{Unemployment Rate} = \left( \frac{\text{Number of Unemployed}}{\text{Labor Force}} \right) \times 100 \]
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First, determine the number of unemployed individuals: \[ \text{Number of Unemployed} = \text{Labor Force} - \text{Number of Employed} \] \[ = 4,000 - 3,500 = 500 \]
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Now, plug the number of unemployed into the unemployment rate formula: \[ \text{Unemployment Rate} = \left( \frac{500}{4,000} \right) \times 100 = 12.5% \]
Therefore, the unemployment rate is 12.5%.