Frank’s electric bill has a cycle day of the 3rd and a due date 8 days later with a one day grace period. what happens if frank pays his electric bill on the 12th of the month?

Given that Frank's electric bill has a cycle day of the 3rd and due date is 8 days later, so that would have a due date of 11th of the month. Since it has a one day grace period which is 12th of the month, this means that if Frank pays his electric bill on the 12th of the month, he won't be paying any late or penalty fee. Hope this helps.