1. Janet just got her credit card bill. The bill is for a 30 day billing period. The bill indicated that she started with a $900 balance, on day 14 charged $200, on day 20 charged $99, on day 26 paid $500. There was no other activity on the account during the 30 day period. What is her average daily balance for the month if calculated inclusive of new purchases on the day they were incurred?
2. What are the monthly finance charges for Janet for the billing cycle described above if charges are based on the average daily balance and a 12% annual rate of interest?