Understanding statistics

Bar chart showing the number of people who had different side effects with a certain treatment. The chart shows:

50 people had headaches = 50%
80 people felt tired = 80%
25 people had a sore throat = 25%.

And some rarer side effects were found too:

1 person had an allergic reaction = 1%
2 people had very itchy skin = 2%
4 people had a stomach ache = 4%.