• It's not clear that the result is in percents
• The result should be compared without rounding
• Rewriting a math formula as a function is not a novel or interesting kata idea

Much better, many thanks for taking the time to add random tests :D

Done!

Thanks, done!

Thanks a lot for your review. Could you please explain to me how do I include this randomly generated test in my kata?

Rounding expectations (2 d.p. in this Kata) should ideally be specified in the Kata Description instead of leaving the user to figure it out by examining the example test cases.

Your Kata needs more extensive test coverage to prevent easy cheap-cheat solutions and/or logically flawed solutions. The most common way to increase test coverage is through the inclusion of randomly generated test cases at runtime so please add these. The lack of test coverage in a Kata as an Issue is recognised as an official CW stance.