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To calculate the balance before making the payment, we need to calculate the interest charged on the purchase amount of $600.
Interest = Principal x Rate
Interest = $600 x 0.12
Interest = $72
So, the total balance on the credit card before making the payment would be:
$600 (purchase amount) + $72 (interest) = $672
Therefore, the credit card balance before making the payment of $200 would be $672.