What percentage of 3m is 30cm?

To find the percentage of 30cm in 3m, we first need to convert both measurements to the same unit. Since 1m is equal to 100cm, 3m is equal to 300cm. Now, to find the percentage, we divide 30cm by 300cm and then multiply by 100 to get the percentage. Therefore, 30cm is 10% of 3m.