I am currently working in West Texas and have some very convoluted NPRI's to calculate. Has there a template developed for this or can someone give me some guidance. Example...Royalty in the holding lease is 1/8th. One of my people have an NPRI of 1/5 of 1/4 of 7/15 of 1/5. Another has 1/2 of 15/300 of 1/8th. Figuring the holding lease is the base 1/8th making it the equivalent of 100%, how do I generate the string of calculations to get the decimal interest I need.