An event manager is tracking participation in a tournament by age group. The manager created the following histogram:

Histogram with title Tournament Participants, horizontal axis labeled Age Group (year) with bins 0 to 19, 20 to 39, 40 to 59, and 60 to 79 and vertical axis labeled Number of People with values from 0 to 60 at intervals of 10. The first bin goes to 30, the second goes to 50, the third goes to 40, and the last goes to 10.

What percentage of the tournament participants are under the age of 20? Round to the nearest whole percent.

10%
23%
30%
77%