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The cross-section of a tunnel perpendicu...

The cross-section of a tunnel perpendicular to its length is a trapezium ABCD as shown in the following figure, also given that: AM= BN, AB= 7m, CD= 5m. The height of the tunnel is 2.4m. The tunnel is 40m long. Calculate :

the cost of painting the internal surface of the tunnel (excluding the floor) at the rate of Rs 5 per `m^(2)` (sq. metre).

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