Star Energy Company owned the following unproved property at 12/31/21:

• Significant Leases:
   Lease A: $300,000, Impairment: $100,000
   Lease B: $500,000, Impairment: $200,000
• Insignificant Leases:
   Lease C: $40,000
   Lease D: $25,000
   Lease E: $20,000
   Lease F: $15,000
   Total Cost: $100,000, Total Impairment: $50,000

Requirement:
 Prepare journal entries for 2022, assuming the following events:
 a. Lease A was fully impaired.
 b. Lease B was sold for $400,000.
 c. Lease C was abandoned.