Question

If 20% of a = b, then b% of 20 is the same as
1. 4% of a
2. 5% of a
3. 20% of a
4. 25% of a

Answer 1

Correct Answer - Option 1 : 4% of a

Formula used 

Percentage = (actual/total) × 100 

Calculation 

⇒ 20% of a = b

⇒ (20 × a)/100 = b

⇒ a = 5b

⇒ a : b = 5 : 1 

so, let a = 5x , b = x 

⇒ 20% of b = 20% × x

⇒ 20x/100 = 0.2x 

⇒ % of a = (0.2x/5x) × 100 = 4% of a

∴ 20% of b is equal to 4% of a