How much would it cost for a 4 day trip to New York?

personal.reaper asked:

My friend and I want to go on a 4 day trip to New York in December to celebrate our 18th Birthday but we are trying to get a rough estimate on how much money it would cost.
We both live in the UK and are both students, any advice/suggestions?
heathrow / gatwick, i don't know what amount i need but i can get hold of enough

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