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?

Question

1) 300,2) 400 3) 250,4) 350 5) 850

Answer 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

Answer 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