Unfortunately the functionality with an extra column in RadCalendar is not supported by RadCalendar. Unfortunately I am not sure whether this type of presentation can be achieved with RadScheduler and its month view as well due to your specific requirement.
A possible workaround it to use a separate control beside the calendar/scheduler which outputs the totals and stays aligned with the weeks. Please excuse me for not being able to provide more elegant solution for your case.
the Telerik team
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