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Paint Interior - Double Garage, Must Be Done Between April 6-10th

I have recently purchased a house and I run a fitness studio from the garage. I would like to get the walls and ceiling painted. The walls are currently painted white but I want them painted black. The garage is 5.7x6.4. I need to get the walls painted before I get the carpet installed which is why it must happen between April 6-10th (I get possession on the 5th). I would appreciate hearing from you and an approximate budget.