Number of fibroblasts was also calculated per microscopical field at 1000x magnification.

The urinary flow rate is still calculated per minute, hence:

Because women attended sessions in small groups, costs were calculated per group of six women.

The rates are usually calculated per 1,000 population.

You can cut costs by forming a group - the price should not be calculated per person.

There is no average calculated for the whole year, but only per subject per semester.

Calculated per share, the figure fell to 50 cents from 68 cents.

Water usage is calculated per full single lock cycle.

The yield rate is usually calculated once per year based on admissions statistics.

Using the Schwartzian transform, the modification time is calculated only once per file.