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A trader mixed grades A, B and C of coffee in the ratio 2:3:5 respectively. Grade A cost sh. 650 per kg, grade B cost sh. 500 per kg and grade c cost sh. 420 per kg.
(a) Find the cost of 1kg of the mixture
(b) If the trader sold the mixture at a profit of 20%, calculate the selling price of 3kg of the mixture