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7 kg slimming tea
Set the price of grade a tea as X.

Then the price of B-class tea is 2/5x.

Then 6x+7X2/5x=60 1.92.

The solution is x=68.4.

Then the first-class tea is 68.4 yuan per kilogram.

Grade B tea is 3 1.36 yuan per kilogram.

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