Joey has a credit card that uses the previous balance method. the opening balance of one of his 30-day billing cycles was $0, but this was his balance for only the first 15 days of the billing cycle. he then made a purchase that increased his balance to $7200, and his balance stayed this amount for the remainder of the billing cycle. if his credit card's apr is 13%, how much was joey charged in interest for the billing cycle?

Type the correct answer in each box. use numerals instead of words. the average number of subscribers to an online magazine each year from 2010 to 2015 is given in the table below. the average number of subscribers to the online magazine in 2010 was the percent increase in the average number of subscribers in 2011 to the average number of subscribers in 2012 was %. the maximum average number of subscribers to the online magazine in the years shown was