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The perimeter of a floor of a room is 18m.What is the area of four walls of the room if it; a height is 3m?

The perimeter of a floor of a room is 18m.What is the area of four walls of the room if it; a height is 3m?

A. 21 Sq.m
B. 42 Sq.m
C. 54 Sq.m
D. 108 Sq.m