A purchasing department sends out about 100 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 20% of their time doing other things. The standard working day is from 0900 to 1600 five days a week, with an hour off for lunch. How many employees do you think the department should employ?