Southwest Airlines provides scheduled air transportation services in the United States. Like many airlines, Southwest leases many of its planes from Boeing Company. In its long-term debt disclosure note included in the financial statements for the year ended December 31, 2017, the company listed $885 million in lease obligations. The existing leases had an approximate ten-year remaining life and future lease payments average approximately $100 million per year.

Required:
1. Determine (to the nearest one-half percent) the effective interest rate the company used to determine the lease liability assuming that lease payments are made at the end of each fiscal year.
2. Repeat requirement 1 assuming that lease payments are made at the beginning of each fiscal year.