Thanks for the reply, so if it is considered fixed, how would you calculate my decimal ownership?

I copied the below from another topic you answered:

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A NPRI is absorbed by the royalty owner to the extent that it does not exceed their royalty. For example, if the NPRI was 20% and the lease provides for 18.75%, then the lease royalty owner receives nothing and the oil company’s net revenue interest is 80%.

SO, if the NPRI is .0325 and your royalty is .1875, then your share of production would be .1875-.0325= 15.50%.
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My situation is 1/12 or 0.0833333 NPRI and a royalty rate of 1/8 or 0.125 so would this be correct for the fixed NPRI?

0.125 - .08333333 = .0416667 my part?

I just want to be sure, since it is a lot of difference in the NPRI part and my part …

Thanks!
Kathy