Hi there!
We must begin by finding the decimal value of the proportion.
[tex]\text{Proportion of allergic reactions = }\frac{\text{Amount of people with reactions}}{\text{total amount of people}}[/tex]
Substitute in the given values:
[tex]p = \frac{48}{6000} = 0.008[/tex]
This is the decimal value. We must multiply by 100 to get the percentage:
[tex]0.008 * 100 = \boxed{0.8\%}[/tex]