Hameed has built a cubical water tank with lid for his house, with each other edge 1.5 m long. He gets the outer surface of the tank excluding the base, covered with square tiles of side 25 cm. Find how much he would spend for the tiles, if the cost of tiles is Rs. 360 per dpzen.
Given,
Each edge of cubical water tank = 1.5m
So,
area of 5 faces of tank(excluding base) = 5×(1.5)2 = 5×150×150 cm2
Area of each tile = 25×25 = 625 cm2
Number of tiles required = 
∵ cost of 1 dozen tiles = Rs.360
∴ cost of 180 tiles (15 dozen) = 15×360 = Rs. 5400
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