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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.
Practicing some Haskell. 3% of my time on this problem was spent working out the calculation, and 97% of it was spent figuring out how to round a double (!) to two decimal places.
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I think I implemented the roundTo function for the n-th time doing all the Katas.