Problem 4-31 Calculating Interest Expense You receive a credit card application from Shady Banks Savings and Loan offering an introductory rate of 2.7 percent per year, compounded monthly for the first six months, increasing thereafter to 18 percent compounded monthly.

Assuming you transfer the $7,800 balance from your existing credit card and make no subsequent payments, how much interest will you owe at the end of the first year?