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
$51,011
$33,992
$24,490
Accounts receivable, net
$5,510
$3,361
$2,422
Inventories
$1,051
$455
$509
Working capital
$20,956
$20,049
$18,645
Annual operating cash flow
$18,595
$10,159
$9,596

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Question: Analyse this data from a financial earnings document. 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?
Choices:
0.36471
69.6
3.94118
0.00365
0.34118
Correct choice index: 0