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80% of $$a$$ is equal to 16% of $$b$$. $$b$$ is $$x\%$$ of $$a$$, then 20% of $$x$$ is ______.
Correct Answer: 100
From $$0.8a = 0.16b$$ we get $$b = 5a$$, so $$b$$ is 500% of $$a$$ and $$x = 500$$. Therefore 20% of $$x$$ is $$\frac{20}{100} \times 500 = 100$$.
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