Length of a class room is two times its height and its breadth is times its height. The cost of white washing the walls at the rate of Rs 1.60 per m2 is Rs 179.20. Find the cost of tiling the floor at the rate of Rs 6.75 per.

• A.  Rs 324   
• B.  Rs 350       
• C.  Rs 420           
• D.  Rs 400
• E.  None of these