Payment for subscriptions is billed one month in advance. first month's payments are pro-rated for the amount due up until the 15th of the month plus the next month's bill amount. all monthly payments are due by the 15th of each month. payments received after the 20th of the month will result in a late fee of $20.00. the late fee may be waived one time per year. 41 a customer calls and has questions about the bill for their first month's subscription. they want to know why the monthly rate is $45.00, but the bill is for $60.00. what is the most likely reason for the bill being this amount?