The annual interest rate on a credit card is 15.99%. If the minimum payment of $40 is made each month, how many months will it take to pay off an unpaid balance of $805.56?

Assume that no new purchases are made with the credit card.

The annual interest rate on a credit card is 15.99%. If the minimum payment of $40 is made each month, how many months will it take to pay off an unpaid balance of $805.56? Assume that no new purchases are made with the credit card. It will take months to pay off the unpaid balance. (Do not round until the final answer. Then round up to the nearest integer as needed.)