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Prorating Subscription and Service Fees
When adding an additional Subscription and / or Exchange to an existing account, all fees for any partial month shall be prorated on a thirty (30)-day-per-month basis and multiplied by the number of days remaining in your billing cycle.
Example:
Your billing cycle date is the 18th of the month. On the 2nd of the month ( 16 days before your billing cycle ), you add CBOT to your service at $53/mo. Divide the $53 by 30 days ( $1.76 per day ), and then multiply it by 16 days = $28.16. This is the prorated partial month for CBOT.