You forgot your table, but I will give an example as for how to answer this question: You need to multiply the percentage of people with black hair by the percentage of people with blue eyes. best change the percentage into numbers.
An example:
people with blue eyes: 25%, which is 1/4
People with black hair: 30%, that is 3/10
so we multiply:
[tex] \frac{1*3}{4*10} = \frac{3}{40} =0.075=7.5%[/tex]%
This is just an example, you need to insert your numbers!
