Final answer:
Suppliers are often charged a percentage fee on card transactions. This fee can vary, and while banks can offer competitive rates, credit card interest rates for consumers can range from 17% to 20%.
Step-by-step explanation:
The student's question pertains to the range of transaction fees that suppliers are charged on card purchases.
In the context of business transactions, such fees are usually a percentage of the purchase value. While banks, especially national ones, can have competitive rates, they can also charge significantly higher fees.
For instance, it's common to see credit card offers with interest rates ranging from 17% to 20%, which are more aligned with consumer finance charges rather than merchant transaction fees.