Area for painting= Perimeter x Length= 3.14×6×40=753.6 Sqm.
So the cost= ₹2×753.6=₹1507.2
The cross-section of a railway tunnel is a rectangle 6 m broad and 8 m high surmounted by a semi-circle as shown in the figure. The tunnel is 35 m long. Find the cost of plastering the internal surface of the tunnel (excluding the floor) at the rate of Rs. 2.25 per m2.