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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.
It's how percent decrease works. Increase in 0.82 times is equal to decrease in 0.18 times.
Not needed, in principle, and if you're speaking to genius. I made three: beforeTaxes, taxOnProfit and afterTaxes. More memory used, more lines, but much more clear. The only think I didn't see was that '1-tax' thing that I don't get yet.
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So much simplier than my solution which uses a bunch of variables that were not needed.