Final answer:
The 0% interest rate is an introductory rate. During the six-month introductory period, Pat will not be charged any interest on his retail purchases. After the introductory period ends, the interest rate will revert to the standard base rate plus 8%.
Step-by-step explanation:
The 0% interest rate is an introductory rate.
An introductory rate is a promotional interest rate that is offered to new credit card customers for a limited period of time. It is designed to attract new customers and encourage them to make purchases with the credit card.
During the six-month introductory period, Pat will not be charged any interest on his retail purchases. After the introductory period ends, the interest rate will revert to the standard base rate plus 8%.