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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.
Maybe give the formulae as they require prior knowledge which has nothing to do with coding, or suggest people google as a legitimate coding skill.
Principal * interest rate = interest
interest * tax rate = tax
Principal + interest - tax = investment return
investment return is next year's principal