NATIONAL INTERGROUP <NII> UNIT RAISES CRUDE PRICES Permian Corp, a subsidiary of National Intergroup, said it raised its crude oil postings by 50 cts a barrel, effective June 17. the company said its new posted price for West Texas Intermediate and West Texas Sour is 19 dlrs a barrel, while Light Louisiana Sweet is now 19.35. The price hike follows other increases industrywide.