To find the total expenditure for firefighters based on the number of firefighters \( x \), you can calculate the total wages and total benefits:
- Wages per firefighter = $40,000
- Benefits per firefighter = $20,000
- Total cost per firefighter = Wages + Benefits = \( 40,000 + 20,000 = 60,000 \)
The equation indicating the total cost for \( x \) firefighters would be:
\[ 60,000x = 600,000 \]
Thus, the correct answer is:
60,000x = 600,000