How do you find the retail purchase price?

Supermarket Channel 8-oz Cup 32-oz Cup 4-oz Cup Multipack Comments Average Retail Price 50.74 $2.70 $2.85 From Exhibit 3 Retail Margin 27.0% 27.0% 27.0% Provided in Case Text - Supermarkets Retail Purchase Price $0.54 $1.97 $2.08 Distributor Margin 15.0% 15.0% 15.00% Provided in Case Text - Supermarkets Distributor Purchase Price 50.46 $1.675 $1.77 Manufacturer Sales Price 50.46 $1.675 $1.77 Cost Per Unit 50.31 50.99 $1.15 From Exhibit 3 Contribution per Unit Sold 0.15 0.69 50.62 Manufacturer Gross Margin =Contribution per unit sold /Manufacturer Sales Price Manufacturer Gross Margin 32.49% 40.91% 34.97% per unit