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Question

A tank open at the top is made of iron sheet 4 m wide. If the dimensions of the tank are 12 m × 8 m × 6 m, find the cost of iron sheet at Rs 17.50 per metre.

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Solution

An open iron tank of dimensions 12 m×8 m×6 m is to be made.Surface area of the open tank=(area of the base)+(total area of the 4 walls)=(12×8)+2×(8×6+12×6)=(96)+2×(48+72)=336 m2Also, it is given that the cost of the iron sheet that is 4 m wide is Rs 17.50 per metre. i.e., the area of the iron sheet=1 m×4 m=4 m2 So, the cost of 4 m2 of iron sheet=Rs 17.50 The cost of iron sheet required to an iron tank of surface area 336 m2 =336×17.504=Rs 1470

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