Area question!!!!!?

Bob Ross wants to coat the ceiling, walls, and floors of a rectangular storeroom with a flame-retardant material that costs $39.95 per gallon. The dimensions of the room are 7 m by 4.5 m. If one gallon covers 110 m squared, how much will Mr.Ross need to spend to protect the storeroom?

Ceiling area = 31.5 m…………..1 x (7×4.5)
Floor area = 31.5 m……………..1 x (7×4.5)
Walls area = 2 x 7 x wall height + 2 x 4.5 x wall height
1 gal coverage = 12,100 m……..110 x 110

You are given the length of the room and the width of the room. But you can’t figure the total area to be coated without the wall height.

Rectangular Flame Bar

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