Two leases in Northern California are being combined to form the North Field Unit.

Lease 1
 WI: 100% Coast Oil Co.
 RI: 1/7 Adam Green
 1/8 Linda Black
 Acreage contributed: 800 acres
 Estimated net recoverable bbls: 310,000 bbls

Lease 2
 WI: 65% River Oil Ltd
 35% Shore Sands Inc
 RI: 1/3 Joe White
 Acreage contributed: 600 acres
 Estimated net recoverable bbls: 380,000 bbls

Requirement:
 a. Determine the participation factors for each party assuming the participation factors are based on the acreage contributed.
 b. Determine the participation factors for each party assuming the participation factors are based on the net recoverable barrels contributed.
 c. Determine the participation factors for each party assuming the participation factors are based on the acreage contributed weighted 60% and the net recoverable barrels weighted 40%.