If 10% of A is the same as 20% of B then A : B is equal

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If 10% of A is the same as 20% of B then A : B is equal to ?

1. 1 : 2
2. 2 : 1
3. 5 : 1
4. 10 : 1

Correct Option: B

10% of A = 20% of B
⇒ 10/100 x A = 20/100 x B
⇒ A/10 = B/5
∴ A/B = 10/5 = 2
Hence, A : B = 2 : 1