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A closed iron tank 12 m long, 9 m wide and 4 m deep is to be made. Determine the cost of iron sheet used at the rate of Rs. 5 per metre sheet, sheet being 2 m wide.
Given,
Length of tank = 12 m
Width of tank = 9m
Depth of tank = 4m
So,
Area of sheet required = total surface area of tank
=
=
Let
=
=
=
Then,
Cost of iron sheet at rate Rs.5 per metre = 5×192 = Rs. 960