8. Find the cost of polishing the floor

The floor of a building consists of 8000 rhombus-shaped tiles, and each of its diagonals is 66 \(cm\) and 140 \(cm\) in length. Find the total cost of polishing the floor if the cost per \(m²\) is \(₹\)5.

 

 

 The total cost of polishing the floor is \(₹\).