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Hello,
number of articles=x( say)
therefore c.pof per article= 900/x
profit on s.p= (x-5)2real profit=( x-5)2- 5(900/x)given profit = 80 therefore(x-5)2-5(900/x)= 802x- 10-4500/x= 802x^2 -10x- 4500= 80xx^2 -5x-2250=40xx^2-45x- 2250=0x^2-75x+30x-2250=0(x-75)(x+30)=0therefore,number of articles=75
number of articles=x( say)
therefore c.pof per article= 900/x
profit on s.p= (x-5)2real profit=( x-5)2- 5(900/x)given profit = 80 therefore(x-5)2-5(900/x)= 802x- 10-4500/x= 802x^2 -10x- 4500= 80xx^2 -5x-2250=40xx^2-45x- 2250=0x^2-75x+30x-2250=0(x-75)(x+30)=0therefore,number of articles=75
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