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A juice parlour uses two ingredients, milk and strawberry syrup, to prepare strawberry milkshake.
The milkshake is prepared by mixing the milk and strawberry syrup in the ratio 7 : 2.
The cost of one litre of milk is $1.20. A litre of strawberry syrup costs five times as much.
What is the cost of preparing 81 litres of the strawberry milkshake?
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