How much does it cost to paint just the floor walls of the room?

A room is 20 ft long, 15 ft wide, and 12 ft high. If it costs 20cents per square foot to paint walls, 30cents per square foot to paint a ceiling, and 10cents per square foot to paint a floor, how much does it cost to paint just the floor walls of the room?How much does it cost to paint just the floor walls of the room?
You question is confusing. If your asking about four walls and not the floor and walls then best add that as a detail to clarify.