Financial report context:
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: .

Financial table:
net tangible assets acquired as of july 27 2006: in-process research and development; $ 12000: 4900
net tangible assets acquired as of july 27 2006: developed technology and know how; $ 12000: 46000
net tangible assets acquired as of july 27 2006: customer relationship; $ 12000: 17900
net tangible assets acquired as of july 27 2006: trade name; $ 12000: 5800
net tangible assets acquired as of july 27 2006: deferred income taxes; $ 12000: -21300 ( 21300 )
net tangible assets acquired as of july 27 2006: goodwill; $ 12000: 182800
net tangible assets acquired as of july 27 2006: estimated purchase price; $ 12000: $ 248100

Additional report context:
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%