If you could explain as well how to answer this on a BA2 calculator I would appreciate, thank you!

You are late paying a bill for $14,488.16. You have made arrangements to pay off the bill in installments of $320 per month, and you will be charged monthly interest of 1.1% on the overdue balance. How many months will it take you to pay off the account balance? How many months will it take you to pay off the account balance? months (Round to the nearest whole number.)