The balance owed on your credit card triples from $600 to $1800 in 99 months. If the balance is growing linearly then it would take 40.5 months to reach $6000. If, on the other hand, the balance is growing exponentially, f(x)=600(1+0.13)x where x represents the number of months, what would the balance be after 40.5 months? Round your answer to the nearest cent.

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