Curriculum Module
APR, Interest & Fees
Interest rates look simple on commercial banners, but the mathematics of compound daily interest are complex. Learn how banks divide APR by 365, audit daily ledger balances, and charge late-penalty rates.
Core Module Reading
APR, Interest & Fees
When Can a Credit Card Company Adjust the APR?
APR and fees determine much of the cost of carrying a credit-card balance. The details can vary by issuer and account, so the safest approach is to understand the general rule and then check the terms that apply to your card. A credit-card ...