Mary has a charge card. She receives a bill, dated January 5. The balance fluctuated during the billing period as follows: the balance was $500 for the first 3 days, $980 for the next 5 days, $255 for the next 10 days, $800 for the next 5 days, and $1,020 for the last 8 days.

Calculate your average daily balance. how to input this problem in the business calculator