To find your earnings per hour, you can divide the total amount earned by the total hours worked.
You earned $280.00 for working 40 hours.
So, the calculation would be:
\[ \text{Earnings per hour} = \frac{\text{Total Earnings}}{\text{Total Hours}} = \frac{280.00}{40} = 7.00 \]
Therefore, your earnings per hour are $7.00.