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in Mathematics by (30.0k points)

A tank 30 m long, 24 m wide and 4.5 m deep is to be made. It is open from the top. Find the cost of iron-sheet required, at the rate of ₹ 65 per m2, to make the tank.

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Length of the tank = 30 m 

Width of the tank = 24 m 

Depth of the tank = 4.5 m

Area of four walls of the tank = 2[L+B] x H = 2(30 + 24) x 4.5 = 2 x 54 x 4.5 m2 

Area of the floor of the tank = L x B = 30 x 24 = 720 m2 

Area of Iron sheet required to make the tank = Area of four walls + Area of floor = 486 + 720 = 1206 m2 

Cost 2 of iron sheet required @ Rs. 65 per m = 1206 x 65 = Rs. 78390

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