Concept Check Find the average daily balance including new purchases. (From Example 1) 1. Payment Purchase End-of-Day Sum of X Number Dates Balance of Days Balances 9/9-9/15 $500 X a. 3500 9/16 $100 600 a. 600 9/17-9/21 a. 600 X 5 b. 3000 9/22 $150 a.450 X b. X 9/23-10/8 a. 450 x b. 16 C 7200 TOTAL a. b. Sum of Daily Balances Number of Days =Average Daily Balance a. lifelong Personal Finance B