Costs for each postal activity (mail processing, delivery, etc) that can be attributed to mail volumes, are divided by total volume to obtain an estimate of the marginal cost.
The costs are calculated by mail volumes, that are then divided by each activity.
They had no idea how much the postal activities costs til they got their invoice each month.
Some cyclists are repairing their bikes.
If multiple ACI units are installed at one site, there aren't really any synergies in consumption.
They sang military songs in school.
The shops are filled with candy floss and souvenirs.
Mary Cavendish tried to awaken the girl.
she is under the bridge