Powell Company Owns an 80% Interest in Sauter, Inc

Powell Company owns an 80% interest in Sauter, Inc. On January 1, 20X1, Sauter issued $400,000 of 10-year, 12% bonds at a premium of $50,000. On December 31, 20X5, 5 years after original issuance, Powell purchased all of the outstanding bonds for $390,000. Both firms use the straight-line method of amortization.
What is the gain on retirement on the 20X5 consolidated income statement?

A) $12,500
B) $22,500
C) $10,000
D) $35,000