The finance charge for this credit card over a month is $2.38.
Data and Calculations:
APR interest rate = 20%
Period Credit Card Balance Finance Charge
Days 1-3: $150 (initial balance) $0.25 ($150 x 20% x 3/365)
Days 4-20: $200 ($50 purchase) $1.86 ($200 x 20% x 17/365)
Days 21-30: $50 ($150 payment) $0.27 ($50 x 20% x 10/365)
Total Finance Charge for the month = $2.38
Thus, the finance charge on the average daily balance for this credit card over a month is $2.38.
Learn more about the finance charge on the average daily balance of a credit card here: https://brainly.com/question/4403314