9. The cost of one candy is (3x + y) and Sam bought (4x + y) candies for his friends from a shop. Find the total amount paid by him in an expression containing x and y.
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9. The cost of one candy is (3x + y) and Sam bought (4x + y) candies for his friends from a shop. Find the total
cost of one candy will be 3xy and
sam bought 4xy
total amount paid by him is 12xy .