If 20% of a = b, then b% of 20 is the same as :

4% of a
6% of a
8% of a
10% of a

Correct Answer: 4% of a

Explanation:

20% of a = b

=> (20/100) * a = b

b% of 20 =(b/100) x 20 = [(20a/100) / 100] x 20= 4a/100 = 4% of a.

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