It just gets worse.

Sentence 1: Definition
Sentence 2: Definition repeated. Annual replaced by “period of time” and Average replaced by “mean.
Sentence 3: Definition repeated. Average replaced by “arithmetic mean”.
Formula 1: Definition of Growth rate.
Formula 2: Step 1 in learning how to do an average.
Formula/Step 3: Step 2 in calculating an average.

The final complex looking formula: Repetition of the above expressed mathematically.

Disclaimer: In replying to your comment, I DID NOT use it, I DID NOT read it, I DID NOT look at it, I DID NOT do ANYTHING with it.