One credit card can have three different rates
Different credit card interest rates apply to different transactions, said Stuart Symons from People's Choice Credit Union.
The purchase interest rate applies to standard purchases and is charged after any interest free days have expired. Cash advances are usually charged at a higher rate and usually don’t get any interest free days.
A balance transfer rate often applies for an introductory period and applies only to money transferred from another card or loan.
Source: Adelaide Advertiser