When calculating this you have to add the finance charge to the carry over balance to get the new balance. Using this you can figure out this minimum payment and new carry over balance.

18. Your friend has a new credit card that they have a carry-over balance of $640. They have an APR of 22.99% with a minimum payment of 5%. Assuming they only make the minimum payment, complete the chart below for the first few months of their new credit card: 8 points