Your credit card billing period starts on the 11th of the month. Assume that you carry a $1,000 unpaid credit card balance as of July 11. For the first 15 days of the billing period, your balance remains at $1,000. Then, you make a $600 payment. This reduces the balance on your card to $400 for the remainder of the billing period. Interest is charged at a rate of 18%, compounded daily. How much interest will you be charged using the adjusted balance method?

1. $15.29

2. $4.06

3. $6.12

4. $10.55