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How big should our Marketing budget be?

Hi! Our project is a crowdsourcing marketplace. We are now building our budget in order to estimate how much we should ask investors. We have a good estimation on the operative costs and IT development costs, but we have no clue on how much to spend in Marketing (Adwords + Social Media). Could somebody please help us to know how big this number should be? or at least the range.. 1K/10K/100K per month? Thanks!