A purchasing department sends out 125 routine orders a day. Each person in the department can deal with three orders an hour, but has to do associated paperwork that takes an average of 40 minutes an order. Each person also loses about 15 % of their time doing other things. The standard working day is from 9:00 to 16:00 five days a week with an hour off for lunch. How many employees do you think department should employ?