How much do typical laundromats cost? It's for a project a school. Washing, drying, and folding separate?

I think you'd better phone your local laundry services, or go there, and ask the prices of various services. I'm sure the prices are different in downtown Manhattan than they are in Montana or Nebraska. At laundromats, you do it all yourself, or you can drop off your laundry for them to wash and dry, and folding is part of the deal.