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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.
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The description is really makes people misunderstanding, the right thing should be: the first month of the decrease percentage is 1.5%, 2 and 3 month is 2.0%, 4 and 5 mouth is 2.5%...
only in this way we could got the right output...
waste my 2 hours...::>_<::