What percent represents a ratio of 8 to 50

The percentage of that ratio is 16%
The simplest way to find any percentage is to divide the numerator by the denominator.
in this case that would be 8/15=0.16
16/100=16%

50 x 2 = 100

8 x 2 = 16

16%

Percent is always out of 100.

It is 2 out of 8 she will pick green and 3 out of 7 she will pick green but red and green would be 5 out of 5 so 50% chance