A closed 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 being 2 wide
Options- a) Rs. 960. B) Rs. 940
C) Rs. 900. D) Rs. 860
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Hence (a) is the correct answer...
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Answer:
Dimensions:
Height = 4 m
Length = 12 m
Breadth = 9 m
Total surface area = 2(lb + bh + lh)
= 2(4 × 12 + 4 × 9 + 12 × 9)
= 2(48 + 36 + 108)
= 2(192)
= 384 sq m
Cost @ rs. 5 per m = 384 × 5 = 1920
Since it is 2 m wide, cost = 1920/2
= rs. 960
Answer: (a) Rs. 960
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