Demand for March = 520 - 12 X 10 = 400 units
Demand for April = 720 - 12 X 10 = 600 units
Demand for May = 520 - 12 X 10 = 400 units
Demand forJune = 620 - 12 X 10 = 500 units
For i = 1,2,3,4, the variables of the model can be defined as
Xi = Net number of temps at the start of month i after any hiring orfiring
Sj = Number oftemps hired or fired at the start of month i
Ii = Units of ending inventory for month i