Final answer:
To find 30% of 420, multiply 420 by 30% (0.30) which equals 126.
Step-by-step explanation:
To find 30% of 420, we simply multiply 420 by 30% (or 0.30).
30% of 420 = 420 * 0.30 = 126
Therefore, the answer is 126.
Learn more about finding a percentage