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Q.

If one side of a cubical box is 30 cm and cost of 100 sq.cm canvas is Rs.3, then the cost of canvas to cover it is

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a

Rs.146 

b

Rs.152 

c

Rs.142 

d

Rs.162 

answer is A.

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Detailed Solution

 

Side of cubical box

a =30cm

T.S.A.

=6 a 2 =6×30×30c m 2

Cost of 100

c m 2 =Rs.3

Cost of canvas

= 6×30×30 100 ×3

=Rs.162

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If one side of a cubical box is 30 cm and cost of 100 sq.cm canvas is Rs.3, then the cost of canvas to cover it is