The formula to calculate the film production wage (W) is:
\[ W = (HR \times H) + (OR \times OH) \]
Where:
Let's say the hourly rate is $20, the hours worked are 40, the overtime rate is $30, and the overtime hours worked are 10. Using the formula:
\[ W = (20 \times 40) + (30 \times 10) \]
We get:
\[ W = 800 + 300 = 1100 \]
So, the total film production wage (\( W \)) is $1100.