table of contents primarily to certain undistributed foreign earnings for which no u.s .taxes are provided because such earnings are intended to be indefinitely reinvested outside the u.s .the lower effective tax rate in 2010 as compared to 2009 is due primarily to an increase in foreign earnings on which u.s .income taxes have not been provided as such earnings are intended to be indefinitely reinvested outside the u.s .as of september 25 , 2010 , the company had deferred tax assets arising from deductible temporary differences , tax losses , and tax credits of $ 2.4 billion , and deferred tax liabilities of $ 5.0 billion .management believes it is more likely than not that forecasted income , including income that may be generated as a result of certain tax planning strategies , together with future reversals of existing taxable temporary differences , will be sufficient to fully recover the deferred tax assets .the company will continue to evaluate the realizability of deferred tax assets quarterly by assessing the need for and amount of a valuation allowance .the internal revenue service ( the 201cirs 201d ) has completed its field audit of the company 2019s federal income tax returns for the years 2004 through 2006 and proposed certain adjustments .the company has contested certain of these adjustments through the irs appeals office .the irs is currently examining the years 2007 through 2009 .all irs audit issues for years prior to 2004 have been resolved .during the third quarter of 2010 , the company reached a tax settlement with the irs for the years 2002 through 2003 .in addition , the company is subject to audits by state , local , and foreign tax authorities .management believes that adequate provision has been made for any adjustments that may result from tax examinations .however , the outcome of tax audits cannot be predicted with certainty .if any issues addressed in the company 2019s tax audits are resolved in a manner not consistent with management 2019s expectations , the company could be required to adjust its provision for income taxes in the period such resolution occurs .liquidity and capital resources the following table presents selected financial information and statistics as of and for the three years ended september 25 , 2010 ( in millions ) : as of september 25 , 2010 , the company had $ 51 billion in cash , cash equivalents and marketable securities , an increase of $ 17 billion from september 26 , 2009 .the principal component of this net increase was the cash generated by operating activities of $ 18.6 billion , which was partially offset by payments for acquisition of property , plant and equipment of $ 2 billion and payments made in connection with business acquisitions , net of cash acquired , of $ 638 million .the company 2019s marketable securities investment portfolio is invested primarily in highly rated securities , generally with a minimum rating of single-a or equivalent .as of september 25 , 2010 and september 26 , 2009 , $ 30.8 billion and $ 17.4 billion , respectively , of the company 2019s cash , cash equivalents and marketable securities were held by foreign subsidiaries and are generally based in u.s .dollar-denominated holdings .the company believes its existing balances of cash , cash equivalents and marketable securities will be sufficient to satisfy its working capital needs , capital asset purchases , outstanding commitments and other liquidity requirements associated with its existing operations over the next 12 months. .
[['', '2010', '2009', '2008'], ['cash cash equivalents and marketable securities', '$ 51011', '$ 33992', '$ 24490'], ['accounts receivable net', '$ 5510', '$ 3361', '$ 2422'], ['inventories', '$ 1051', '$ 455', '$ 509'], ['working capital', '$ 20956', '$ 20049', '$ 18645'], ['annual operating cash flow', '$ 18595', '$ 10159', '$ 9596']]
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Question: as of september 25 , 2010 , the company had $ 51 billion in cash , cash equivalents and marketable securities . what percentage of the change in 2010 was due to cash generated by operating activities?
Answer: 36.4%