hologic , inc .notes to consolidated financial statements ( continued ) ( in thousands , except per share data ) the aggregate purchase price for suros of approximately $ 248000 ( subject to adjustment ) consisted of 2300 shares of hologic common stock valued at $ 106500 , cash paid of $ 139000 , and approximately $ 2600 for acquisition related fees and expenses .the company determined the fair value of the shares issued in connection with the acquisition in accordance with eitf issue no .99-12 , determination of the measurement date for the market price of acquirer securities issued in a purchase business combination .the components and allocation of the purchase price , consists of the following approximate amounts: .
[['net tangible assets acquired as of july 27 2006', '$ 12000'], ['in-process research and development', '4900'], ['developed technology and know how', '46000'], ['customer relationship', '17900'], ['trade name', '5800'], ['deferred income taxes', '-21300 ( 21300 )'], ['goodwill', '182800'], ['estimated purchase price', '$ 248100']]
the acquisition also provides for a two-year earn out .the earn-out will be payable in two annual cash installments equal to the incremental revenue growth in suros 2019 business in the two years following the closing .the company has considered the provision of eitf issue no .95-8 , accounting for contingent consideration paid to the shareholders of and acquired enterprise in a purchase business combination , and concluded that this contingent consideration represents additional purchase price .as a result , goodwill will be increased by the amount of the additional consideration , if any , when it becomes due and payable .as part of the purchase price allocation , all intangible assets that were a part of the acquisition were identified and valued .it was determined that only customer lists , trademarks and developed technology had separately identifiable values .customer relationships represents suros large installed base that are expected to purchase disposable products on a regular basis .trademarks represent the suros product names that the company intends to continue to use .developed technology represents currently marketable purchased products that the company continues to resell as well as utilize to enhance and incorporate into the company 2019s existing products .the estimated $ 4900 of purchase price allocated to in-process research and development projects primarily related to suros 2019 disposable products .the projects are of various stages of completion and include next generation handpiece and site marker technologies .the company expects that these projects will be completed during fiscal 2007 .the deferred income tax liability relates to the tax effect of acquired identifiable intangible assets , and fair value adjustments to acquired inventory as such amounts are not deductible for tax purposes , partially offset by acquired net operating loss carry forwards that the company believes are realizable .for all of the acquisitions discussed above , goodwill represents the excess of the purchase price over the net identifiable tangible and intangible assets acquired .the company determined that the acquisition of each aeg , r2 and suros resulted in the recognition of goodwill primarily because of synergies unique to the company and the strength of its acquired workforce .supplemental pro-forma information the following unaudited pro forma information presents the consolidated results of operations of the company , r2 and suros as if the acquisitions had occurred at the beginning of each of fiscal 2006 and 2005 .

Question: what percentage of the estimated purchase price is due to developed technology and know how?
Answer: 19%