A seasonal manufacturing operation began the calendar year with 14 employees. During the year, employees were hired or laid off on various dates as shown in the following table.

What was the average number of employees on the payroll during the calendar year?
(Assume that each month has the same length.)

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Date Employee changes April 1 May 1 June 1 September l October 1 7 hired 8 hired 11 hired 6 laid off 14 laid off