20. The cross-section of a tunnel perpendicular to its
length is a trapezium ABCD as shown in the adjacent
diagram. AM = BN, AB = 4.4m CD = 3m. The
height of the tunnel is 2.4 m. The tunnel is 50 m long
Calculate (1) the cost of painting the internal surface of
the tunnel (excluding the floor) at the rate of Rs 5 per m^2. (ii) the cost of paving the floor at the rate of
Rs 18 per m^2
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Correct answer is ₹ 2040
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