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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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self-resolved
After 25,25,25,25,25. You have: 25x5
Then, the customer gives you 100, you give the customer 75 changes(25x3)
Now, You have: 100x1,25x2
At last, another customer gives you 100, you have only 50 changes(25x2), but you need 75 to give back.
this case should return "NO"