The absolute mininum for 85 packs is 85 points, if you get only rice Onigiri, maximum is 425, if by some miracle you only get Panda. I don't know the exact Ratios, but through the free 15 I've gotten 1 Panda, 6 Salmon, 8 Rice.

It's just easier (but longer) to wait a bit longer, this event's unreliable with pricing. But I'm pretty sure 85 will be something like 5-10 Panda, which'd be good, and then sorta cut 40-60 between salmon-panda.

Points per Onigiri

-----------------------------------

Rice-1

Salmon-3

Panda-5