book Maths Puzzle Numerical Ability

Simplify:
x-y/x+2y times 2y+x/y+x divided by y-x/x+y

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book Other Question

i need help solving this equation: r(R1+R2)=R1R2,for R PetStore pays wholesaler $1.00 for dog bed and sells it for $21.00. What is the mark up? 21-1=20, 20=(x)(1), 20/1=x, 0.200. The markup is 200%. Is this correct?