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Given that: $60 \%(x-y)=30 \%(x+2y)$

$\implies 0.6(x-y)=0.3(x+2y)$

$\implies 2(x-y)=(x+2y)$

$\implies 2x-2y=x+2y$

$\implies x=4y\implies y=\frac{x}{4}\times\frac{100}{x}=25\%$

Option (D) is correct.

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