EAR (Effective Annual Rate)
The true yearly rate once compounding within the year is counted — so a card quoting 2% a month is really about 27% a year, not 24%. It's the honest number for comparing rates that compound at different frequencies.
Where this is taught
Definitions are the trailer. These free levels turn EAR into something you play — one bite-size lesson, with worked examples, a quiz and XP.