Final answer:
The exact deposit required per person for a 7-day cruise is not provided in the question and would typically depend on the cruise line's specific policies, which could be based on a percentage of the total cost or a flat fee. The onboard bills mentioned are related to end-of-cruise payments, not deposits.
Step-by-step explanation:
To determine how much of a deposit may be required per person on a 7-day cruise based on onboard transactions, one would need access to specific pricing and deposit policies of the cruise line, which are not provided in the question. However, the question mentions the onboard bills for a seven-day cruise, without specifying the actual amounts. In such cases where specific financial information is needed but not given, one might need to consult the cruise line directly or review the terms and conditions of the cruise to find out the exact deposit requirement.
On a general note, deposits for cruises are often determined by a percentage of the total cost, or a flat fee, and can vary widely by the cruise line and the length of the cruise. As this scenario pertains to onboard transactions which are paid at the end of the cruise, it doesn't directly relate to the deposit required at the time of booking.