If 20% of a = b, then b% of 20 is equal to:
Given, 20% of a = b
Then, b% of 20 = 20% of b = 20% of 20% of a
= $$\dfrac{1}{5}\times\dfrac{1}{5}\times a = \dfrac{1}{25}\times a$$
= 4% of a
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