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There are no single cabins on RCI, so you would have a double cabin for sole occupancy. You will pay a premium of around 150%.
Afraid so can vary between 20 and 75% and Royal Caribbean on one site were quoted at 200% but with certain of their ships on certain cruises a lot lower so you need to contact a specialist cruise advisor try the number above 0800 091 1629. I use them and they are very good.