Tangshan Mining borrowed $150,000 for one year under a revolving credit agreement that authorized and guaranteed the firm access to $200,000. The revolving credit agreement had a stated interest rate of 7.5 percent and charged the firm a 1 percent commitment fee on the unused portion of the agreement. Based on this information, the effective annual interest rate on the loan is 8.5% 7.5% 7.83% 8.83%