math

cost price of article a is 100 more than cost price of article b. article a was sold at 40% profit and article b at 40% loss.if overall profit earned after selling both the articles is 5%,then what is cost price of article b?
1) 300,2) 400 3) 250,4) 350 5) 850

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  1. let cp(b)=x and cp(a)=x+100
    sp of a=x*140/100
    sp of b=(x+100)*60/100

    (x*140/100)+(x+100)*60/100=(x+x+100)*105/100
    on solving this i got,
    x=4.5

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  2. A=100+B
    .05(A+B)=.4A-.4B
    .05(100+B+B)=.4(100+B)-.4B
    5+.1B=40+.4B-.4B
    .1B=35
    B=350

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    bobpursley

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