In the first survery [tex] \frac{336}{500} [/tex] considered cola.
Assuming we can extrapolate this ratio, all we have to do is get the same ratio, but out of 2000 people.
[tex] \frac{336}{500} * \frac{4}{4} \\ \frac{1344}{2000} [/tex]
The answer is 1344 people.