15 kg is ___% of 50 kg.

The correct answer is Option (1) → 30

To express one quantity as a percentage of another, divide it by the other and multiply by 100.

• 15 kg as a percentage of 50 kg \(\displaystyle =\frac{15}{50}\times100=30\%\)

Option (3), \(\frac{3}{10}\), is the same ratio as a fraction, not as a percentage.