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?