Which credit card should I pay off first?

I have $1,600 free to use on payment toward a credit card but I have an issue. I have two credit cards, one is an open account with 0% APR till 2018 t

I have $1,600 free to use on payment toward a credit card but I have an issue. I have two credit cards, one is an open account with 0% APR till 2018 that has a 1,500.00 balance with a $20 minimum payment.

The other one is a closed account with a high APR (23.0%) that has a 1,597.00 balance with a $50 minimum payment.

Which card should I pay off first?

or:I have $1,600 free to use on payment toward a credit card but I have an issue. I have two credit cards, one is an open account with 0% APR till 2018 that has a 1,500.00 balance with a $20 minimum payment. The other one is a closed account with a high APR (23.0%) that has a 1,597.00 balance with a $50 minimum payment.Which card should I pay off first?

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