Final answer:
The exact deposit amount for a 4 day cruise isn't provided, but cruise lines typically require a deposit that varies by company and cruise length. Onboard transactions are cashless, with a final bill settled at the end of the cruise. Caribbean cruises don't operate during hurricane season, which affects availability.
Step-by-step explanation:
The question seems to ask about the deposit amount for a 4 day cruise, but it doesn't provide specific information about deposits; instead, it gives information about the onboard spending for a different cruise. However, using this information we can touch on general practices regarding cruise booking and payments. Typically, cruise lines require a deposit at the time of booking, and the amount can vary by company and length of the cruise. The summary of bills provided for a 7-day cruise doesn't directly answer the question about deposits but suggests substantial spending during the cruise, which could be used to inform passengers on potential total cost.
The information regarding the cashless system on cruises informs us about how billing generally works aboard a cruise ship, indicating that while on board, expenses other than souvenirs are charged to an account that is settled at the end of the trip. Also, the tidbit about Caribbean cruise ships not operating during hurricane season is important for travelers to consider when planning their cruises, as it affects availability and scheduling. Ultimately, the deposit amount for a particular 4 day cruise would need to be obtained directly from the cruise line or a travel agent.