A charity is keeping track of donations for one month. The director would like to create a report that groups data by week. Each group will contain donations collected on each day of the week. Which type of calculated figure should the director use to display a cumulative total beneath each group?

A running sum adds each day's donations to the total accumulated so far, so it can show a cumulative amount for the days in each weekly group. A regular sum adds all donations in a group but does not show the accumulating total beneath the group. The correct choice is running sum.

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