I think you're confusing their interest in the block (presently 40%, but in dispute) with the net take in an indonesia PSC
The way an Indonesian PSC works is basically this: From production first 10% goes to the government of remaining 90%, all can be offset against costs, both existing exploration and dev and opertaing. the remaining production is split say 33% to contractor, 67% to government. Then contractor pays 44% tax on their 33%, resulting in approx 15% net to contractor.
The cost recovery is basically getting money back that you have spent.
Therefore the SALES VALUE of a discovery is 40% of 15% of reserves.
The qustion is do the reserves cover the cost of development? then you can work out an NPV.
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