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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 did not like that the solution requires rounding the savings (although stated in the instructions). The true amount of savings should be math.trunc or math.floor, because the bank won't be pitching in the extra cash to bump you to the nearest integer.