We want to share an important update with our Betfair Community users.
Over the coming months, the Betfair Community platform will be winding down. The final active day for the platform will be December 21st. From December 22nd, users will no longer be able to access the platform.
Your discussions, insights, engagement, and, most importantly, feedback have helped shape the platform and guided innovation. Your feedback continues to be important to us, and we will continue to listen via our dedicated feedback channels, as well as through product testing and innovations.
To share your feedback and experience, visit: https://support.betfair.com/app/home

It does not make sense to refer to more than 100% of a whole. Percentages over 100% can be used, but they should be used with care as they can very easily be misleading.
But two halves make a whole, so it's the same thing. And saying 120% is not correct word usage.