Percentage cover and frequency

[@LeslieDuan]

Thanks a lot. It's very clear and helpful.

[@davea.richards9744]

I know this stuff but needed a reminder.

[@PetronellaChate]

Thank you very much well explained

[@stolenheartxx1777]

Thank you!

[@ziadelhariry6158]

thank you very helpful

[@naiomipersaud1317]

omg this is my handwriting :$