If 20% of a = b, then b% of 20 is the same as:
4% of a
5% of a
20% of a
None of these
Explanation:
$20$% of$ a=b \implies \dfrac{20}{100}a=b.$
$\therefore b$% of 20$=\left(\dfrac{b}{100}\times 20\right)=\left(\dfrac{20}{100}a \times \dfrac{1}{100}\times 20\right)=\dfrac{4}{100}a=4 $% of a$ $