Your credit card charges 21% interest, compounded monthly. Here is your activity for October, 2018. (It was not a leap year)

1. What is the service charge if your credit card uses ending balance method?

	Date	Amount	Balance	Days
Start of October			300
Charge	10/4	80
Payment	10/7	300
Charge	10/20	20
Charge	10/31	10