The floor of a room is in the shape of a square of side 4.8 metres . The floor is to be covered with square tiles of perimeter 1.2m . Find the cost of covering the floor if each tile cost₹27.
Working for 8 hours, 40 people can build in 21 days. Working for 10 hours the work will be completed in 14 days. How many people need to complete the same work?