Drill Rig

How do we calculate IRR with depreciated value of equipment over 10 years period?

This is regarding a drilling rig we want to hire. The Contractor needs to invest $36 million for buying the new rig. Supposing 15% residual value remains after 10 years period then how do we calculate IRR and what is the significance of having 12% & 10% IRR. Contractor has shown following annual values in a table for 10 years - Revenue, cash cost, operating cash flow (Revenue-cash cost), Rig capex, Working Capital & cumulative cash flow (rig Capex+working capital - annual cash flow). These have been worked out for 10 years and rig capex reduces by 85% in 10 years time. Contractor has calculated IRR with these figures. But how is not known to us.
Your help in understanding this concept would be highly appreciated.

Way too complicated for an answer here, me thinks. Spend the cash for a good CPA or Comptroller.

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