Michaela transferred a balance of $5275 to a new credit card at the beginning
of the year. The card offered an introductory APR of 8.1% for the first 4
months and a standard APR of 34.5% thereafter. If the card compounds
interest monthly, which of these expressions represents Michaela's balance
at the end of the year? (Assume that Michaela will make no payments or new
purchases during the year, and ignore any possible late payment fees.)
