Sum

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 m^{2}, to make the tank.

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#### Solution

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 m^{2} = 486 m^{2}

Area of the floor of the tank = L x B = 30 x 24 = 720 m^{2}

Area of Iron sheet required to make the tank = Area of four walls + Area of floor = 486 + 720 = 1206 m^{2}

Cost of iron sheet required @ ₹ 65 per m^{2} = 1206 x 65 = ₹ 78390

Concept: Surface Area of a Cuboid

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