If 20% of a = b, then b% of 20 is the same as :
Correct Answer: Option A
20% of a = b => (20 \(\div\) 100)a = b
b% of 20 =(b \(\div\) 100) \(\times\) 20 = (20a \(\div\) 100) \(\times\) (1 \(\div\) 100) \(\times\) (20) = 4a \(\div\) 100 = 4% of a.
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