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A liter is 1.0567 as much as a quart.
So 2 liters is 1.0567 times as much as 2 quarts,
so 2 liters should therefore sell for 1.0567 times as much
as 2 quarts.
1.0567 times $1.29 is $1.363143. So if 2 liters sells for $1.36
it would be a little cheaper than by the quart, and if 2 liters
sells for $1.37 it would be a little more expensive than by the
quart.
Edwin