Saturn Energy owned the following unproved property at 12/31/67:

• Significant Leases:
   Lease A: $400,000, Impairment: $190,000
   Lease B: $600,000, Impairment: $210,000
• Insignificant Leases:
   Lease C: $70,000
   Lease D: $55,000
   Lease E: $50,000
   Lease F: $40,000
   Total Cost: $215,000, Total Impairment: $70,000

Requirement:
 Prepare journal entries for 2068, assuming the following events:
 a. Lease A was fully impaired.
 b. Lease B was sold for $590,000.
 c. Proved reserves were found on Lease D and Lease E.