The model will calculate the rest and will give you your Customer Acquisition Cost and the Total Customer Acquisition Expense. You will also see your annual summaries and averages for all these numbers. The model runs for 60 months with a 5 year annual summary view.
The instructions in the model walk your thru a step by step process of how to manage this model. It's super simple and super easy. Just order a $5 gig and I'll send it to you within a couple of hours max (unless it's a night time in Minneapolis (CST).