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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 know this is old, but if you calculate the percentage as percentage = (sum/x)*100 (or whatever your language) it should always return the right percentage, though you'll need to use math.Floor() or whatever equivalent if you don't want the decimals to run off into space.