K Three varieties of coffee Coffee A, Coffee B, and Coffee C-are combined and roasted, yielding a 50-lb batch of coffee beans. Twice as many pounds of Coffee C, which retails for $12.76 per lb, are needed as Coffee A, which sells for $15.37 per lb. Coffee B retails for $12.31 per lb. How many pounds of each coffee should be used in a blend that sells for $13.34 per lb? Should be used n lb. of Coffee A, lb. of Coffee B and lb. of Coffee C. (Round to two decimal places as needed.)