The length of a wall is 4m, breadth is 15cm and height is 3m. How many bricks of measurement $20cm\times 10cm\times 8cm$ will be required to build the wall. If the cost of bricks is Rs. 120 per one thousand then find the total cost of the bricks.

The correct option is B Rs. 13,500
Volume of the wall $=4000\ast 15\ast 3000c{m}^3=180,000,000c{m}^3$

Volume of Bricks $=20\ast 10\ast 8c{m}^3=1600c{m}^3$

Number of Bricks Required $=\frac{VolumeofWall}{Volumeof1Brick}=\frac{180,000,000}{1600}=1,12,500$

Cost of Bricks per thousand = $120$

So, Total cost $=\frac{1,12,500}{1000}\ast 120=Rs.13,500$