STATEMENT BALANCE. Your credit card statement period CLOSES on the 15th of every month and a new statement period OPENS on the 16th, your credit card payments have a DUE DATE on the 1st of every month. You have an APR of 28.99%. 13a) If you made a purchase for a new phone for $900 on October16^th, how many interest free days will you have left? 13b) When will you have to pay for the purchase in full in order to avoid finance charges? (Exact day of the exact month.) 13c) If you can pay only $80 per month, how long would it take for you to pay it off and how much interest would you end up paying for the purchase? (You can use an online credit card payoff calculator on www.Bankrate.com or another online site).