It would have to take into account sales projections and resource/employee budgeting, which would almost certainly not be general knowledge. We could probably figure out what percentage of a pack's cost the average animal is. I say average as it no doubt takes more work (more time, more money) on some than on others.
I'm going to try to roughly figure this out. Keep in mind the animal costs are an average and are in US dollars. Some would be less, some would be more. If you take the scenery packs have 3 animals less than animal packs, the first thought would be that the scenery is counting for $5USD, as that ends up being about $1 per animal left over. But comparing the animal pack at $1 per animal doesn't work out though as that's only $8.
It can't be $1.50 per habitat animal as that alone is $10.50 and then the exhibit animal on top of that. If we took the cost at $1.25 per animal though, that's $10, including the exhibit animal in that average. 5 animals on this would be $6.25 so three would be $3.75, or roughly that amount for the scenery pieces. I'm thinking average animal cost is probably in that range. Some may cost out to more than $2 and some may cost out to less than 50 cents so that $1.25 sounds about right to me.
Without budget knowledge we don't know how it much it actually costs. If they're looking at selling 1,000 units $1250 per animal which sounds low given the turnaround time. Maybe they're projecting to sell at least 10,000 units, to get $12,500 per animal. Maybe it's twice that, or 5,000.
Argh. Then you have to figure in marketing which I didn't even consider here. That's probably not too much cost per pack to translate to animal, but I wouldn't be surprised if it was 10% of of the budget.
Anyways, that's my best guess on the first steps. Apologies community managers, if taking this close of a look at it may be against the rules, if it is, please feel free to delete my post. I don't want to cause any trouble. Thank you!