the cost of 8 pen and 12 pencil is 82 what would be the cost of 36 pen and 54

lets assume pen' cost id x and pencil's cost is y then
8x+12y=82
(4x+6y)=41

9(4x+6y)=41*9
36x+54y=936

so answer is 936
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8 pen+12 pencils=82
multiply above equation by 4.5
36 pen+ 54 pencils=82*4.5=369
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8x + 12y=82
multiplying whole eq with 1/2 we get
4x + 6y =41
multiply this with 9 we get desire result that is
36x + 54y =369 ans
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Ans 369.

4.5(8 pen+ 12 pencils=82)

36 pen+ 54 pencils= 369.
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the cost of 8 pen and 12 pencil is 82.what would be the cost of 36 pen and 54 pencil ?