Correct Answer - Option 2 : 28 pounds

**Given:**

Weight of baby at the time of birth = 3.5 kg

**Formula Used:**

1 kg = 1000 gram

1 pound = 453.592 gram

≈ 450 gram

**Calculation:**

As weight is increased by 2.25 kg every year

So, weight of baby after 4 years = 3.5 + 2.25 + 2.25 + 2.25 + 2.25 = 12.5 kg

And, 12.5 kg = 12.5 × 1000 gram = 12500 gram

As, 1 pond = 450 gram

∴ 12500 gram = (1 ÷ 450) × 12500] pounds = 27.7 pounds

≈ 28 pounds

**∴ The weight of the baby after 4 years is 28 pounds.**