And don't even get started on "Improved by 40%" (1.4x) being occasionally referred to as "Improved to 140%" (1.4x), which then is backported "Improved by 140%"

And don't even get started on "Improved by 40%" (1.4x) being occasionally referred to as "Improved to 140%" (1.4x), which then is backported "Improved by 140%" (to 2.4x). The real problem is percentages; people also intuitively assume "50% less than (50% more than X) is X"