Pharmax Distributors specializes in the distribution of pharmaceutical products at the retail level. Pharmax's customer base is comprised of three main retail groups: general supermarket chains, large drugstore chains, and small, single-store "Ma & Pa" pharmacies. To evaluate the relative profitability of each customer group, Pharmax plans to use an allocation system that recognizes the relative demands that these groups place on the company's resources. Parmax's chief accountant examined the firm's support costs and activities and collected the following data for a typical operating period: