MacBride Enterprises sold $200,000 of bonds on January 1, 2020. A portion of the amortization table appears below.

Required:
1. Indicate the stated annual interest rate on these bonds.
2. Calculate the effective annual interest rate on these bonds.
3. Determine the interest expense and premium amortization for the interest period ending December 31, 2021.
4. Determine when the bonds will mature.