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Q.

A tank 15 m long, 10 m wide and 6 m deep open at the top.  If the width of the sheet is 2 m, then cost of iron sheet at the rate of Rs.5 per meter is

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a

Rs.1125

b

Rs.1150

c

Rs.550

d

Rs.1050

answer is C.

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Detailed Solution

Total surface area (excluding top) of the tank =450 sq.m
450 sq.m=L×2 m(i.e., area of sheet required)
∴L=225 m
∴Cost at rate Rs.5/m is 225×5=Rs.1125

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