River Energy Company owned the following unproved property at 12/31/51:

• Significant Leases:
   Lease A: $320,000, Impairment: $110,000
   Lease B: $480,000, Impairment: $150,000
• Insignificant Leases:
   Lease C: $35,000
   Lease D: $28,000
   Lease E: $22,000
   Lease F: $14,000
   Total Cost: $99,000, Total Impairment: $40,000

Requirement:
 Prepare journal entries for 2052, assuming the following events:
 a. Lease A was sold for $330,000.
 b. Lease B was fully impaired.
 c. Proved reserves were found on Lease C and Lease F.