A) 4% of a
B) 5% of a
C) 20% of a
D) none of these
Correct Answer: A
Solution :
(a): 20% of a =b \[\Rightarrow \frac{a}{5}=b\] b% of \[20=\frac{b}{100}\times 20=\frac{b}{5}=\frac{1}{5}\times \frac{a}{5}\]\[=\frac{a}{25}\] Now, \[\frac{a}{25}=\frac{4a}{100}=4%\,\text{of}\,a.\]
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