The daily penalties do not account for the initial base multiplier. You never get full listed value feeding trophies to companions.
If you compare the experience gained at 0% pen to 90% pen for the same size stack of the same trophies you will see you get 90% less experience.
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Computing the probability that at least one of the following events will occur:
P(a or b ... or z) = 1 - P(!a and !b ... and !z)
Probability
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