The cost of carpeting a room 18 m long with a carpet 75 cm wide at 4.50 per metre is 810. The breadth of the room is:	Choose the correct option
A) 7 m	B) 7.5 m	C) 8 m	D) 8.5 m	E) None of these
Length of the carpet = TotalCost/Rate/m   = (8100⁄45)m = 180 m.   Area of the room = Area of the carpet   = (180 × 75⁄100) m2 = 135 m2   ∴ 7.5 mreadth of the room = AreaLength=135/18= 
<gadget id="calculator">135/18</gadget>
<output>15/2 = around 7.5</output>
7.5 m   Answer 7.5 m
<result>B</result>
The cost of carpeting a room 18 m long with a carpet 75 cm wide at 4.50 per metre is 810. The breadth of the room is: