notes to the audited consolidated financial statements 6 . equity investments eastman has a 50 percent interest in and serves as the operating partner in primester , a joint venture which manufactures cellulose acetate at eastman's kingsport , tennessee plant . this investment is accounted for under the equity method . eastman's net investment in the joint venture at december 31 , 2007 and 2006 was approximately $ 43 million and $ 47 million , respectively , which was comprised of the recognized portion of the venture's accumulated deficits , long-term amounts owed to primester , and a line of credit from eastman to primester . such amounts are included in other noncurrent assets . eastman owns a 50 percent interest in nanjing yangzi eastman chemical ltd . ( 201cnanjing 201d ) , a company which manufactures eastotactm hydrocarbon tackifying resins for the adhesives market . this joint venture is accounted for under the equity method and is included in other noncurrent assets . at december 31 , 2007 and 2006 , the company 2019s investment in nanjing was approximately $ 7 million and $ 5 million , respectively . in october 2007 , the company entered into an agreement with green rock energy , l.l.c . ( "green rock" ) , a company formed by the d . e . shaw group and goldman , sachs & co. , to jointly develop the industrial gasification facility in beaumont , texas through tx energy , llc ( "tx energy" ) . eastman owns a 50 percent interest in tx energy , which is expected to be operational in 2011 and will produce intermediate chemicals , such as hydrogen , methanol , and ammonia from petroleum coke . this joint venture in the development stage is accounted for under the equity method , and is included in other noncurrent assets . at december 31 , 2007 , the company 2019s investment in tx energy was approximately $ 26 million . eastman also plans to participate in a project sponsored by faustina hydrogen products , l.l.c . which will use petroleum coke as the primary feedstock to make anhydrous ammonia and methanol . faustina hydrogen products is primarily owned by green rock . the company intends to take a 25 percent or greater equity position in the project , provide operations , maintenance , and other site management services , and purchase methanol under a long-term contract . capital costs for the facility are estimated to be approximately $ 1.6 billion . project financing is expected to be obtained by the end of 2008 . the facility will be built in st . james parish , louisiana and is expected to be complete by 2011 . on april 21 , 2005 , the company completed the sale of its equity investment in genencor international , inc . ( "genencor" ) for cash proceeds of approximately $ 417 million , net of $ 2 million in fees . the book value of the investment prior to sale was $ 246 million , and the company recorded a pre-tax gain on the sale of $ 171 million . 7 . payables and other current liabilities december 31 , ( dollars in millions ) 2007 2006 .
what was the ratio of the investment prior to sale to the pre-tax gain on the sale
the current portion of post-employment obligations is an estimate of current year payments in excess of plan assets. .