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Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
Get started now by creating a new collection.
I believe that when you arrive at the first 100 you'd have 3 50's and no 25's, and thus be unable to provide change for a 100 (no bill combination summing to 75)
bills are 100, 50 and 25. so if anybody paid 25 before the person paying 100, you will have change (4x25, 1x50 and 2x25, etc).