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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.
THe description has a place for 'examples' and it doesn't actually list any.
Test cases are a bit weird. You should require 2 decimal places at all times, since sometimes having decimals and somtimes not is confusing. Also, some of these answers might only return 1 decimal place at times.
It should be listed in the description that you are not allowed to add additional return statements.