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The surface area of the room that needs to be painted includes the four walls, the floor, and the ceiling.
Surface area of the walls = 2(length x height) + 2(width x height)
Surface area of the walls = 2(20ft x 9ft) + 2(15ft x 9ft)
Surface area of the walls = 360 sq. ft. + 270 sq. ft.
Surface area of the walls = 630 sq. ft.
Surface area of the floor = length x width
Surface area of the floor = 20ft x 15ft
Surface area of the floor = 300 sq. ft.
Surface area of the ceiling = length x width
Surface area of the ceiling = 20ft x 15ft
Surface area of the ceiling = 300 sq. ft.
Therefore, the total surface area that needs to be painted is:
630 sq. ft. (walls) + 300 sq. ft. (floor) + 300 sq. ft. (ceiling) = 1230 sq. ft.
So, the surface area of the room that Monica will paint is 1230 square feet.