1. Billy has a credit card with a grace period of 30 days. He has a balance of $32,000. The APR on his credit card is 46.2% This balance has been unpaid for 360 days (~1 year). How much will his $32,000 balance grow to at the end of 360 days?

2. Sarah has a credit card with a balance of $2,500. Her grace period is 21 days, and her APR is 26.18%. She paid off her debt within 9 days. How much did her interest grow?

3. John's balance on his credit card is $4,100. His credit card does not offer a grace period, so interest starts accruing immediately. His APR is 18.26%. His financial difficulties prevented him from paying off the credit card in full until 90 days later, when he paid the card off in full. How much interest accrued? In addition, how much did he have to pay back the bank from the initial balance of $4,100?