How important is population in resource production exactly?

For instance I know that 544 workers and a level 5 metal mine give you 20 metal (facilities) and 108 metal (workers) for a total of 128 metal per tick.

How much would I be making if I had for instance.. 700 workers?

Which I guess brings me to the final question, how should I be using my blue tokens?

1) Using 100 on cloning pods for population
2) Using 100 for the light metal boost
3) Saving 200 for the 50% metal production boost

Thanks

The more workers you have the more metal/oil you get. I dont know the exact numbers, but always try to keep your worker numbers high! Unless its something urgent and have to make many units.
Also workers give you power.

ABout the tokens, its really up to you. Of these i prefer using metal!

You say you get 108 from workers, if you use metal production you will get +54 for some ticks, which is the half of 108. Now if you get more workers, that will increase, if you lose it will fall.
Make the math and see what suits you best!!!

About the tokens,I personally prefer to use them on workers as that is the only one that will help you long term unless you like to hurry units.So if you dont hurry your units often,use the tokens on workers.