accounts receivable , net october 31 , 2006 october 31 , 2005 dollar change change .
considering the year 2006 , what is the percentage of working capital among the total accounts receivable?
the increase in accounts receivable was primarily due to the increased billings during the fiscal year ended october 31 , 2006 . days sales outstanding ( dso ) was 39 days at october 31 , 2006 and 36 days at october 31 , 2005 . our accounts receivable and dso are primarily driven by our billing and collections activities . net working capital working capital is comprised of current assets less current liabilities , as shown on our balance sheet . as of october 31 , 2006 , our working capital was $ 23.4 million , compared to $ 130.6 million as of october 31 , 2005 . the decrease in net working capital of $ 107.2 million was primarily due to ( 1 ) a decrease of $ 73.7 million in cash and cash equivalents ; ( 2 ) a decrease of current deferred tax assets of $ 83.2 million , primarily due to a tax accounting method change ; ( 3 ) a decrease in income taxes receivable of $ 5.8 million ; ( 4 ) an increase in income taxes payable of $ 21.5 million ; ( 5 ) an increase in deferred revenue of $ 29.9 million ; and ( 6 ) a net increase of $ 2.8 million in accounts payable and other liabilities which included a reclassification of debt of $ 7.5 million from long term to short term debt . this decrease was partially offset by ( 1 ) an increase in short-term investments of $ 59.9 million ; ( 2 ) an increase in prepaid and other assets of $ 27.4 million , which includes land of $ 23.4 million reclassified from property plant and equipment to asset held for sale within prepaid expense and other assets on our consolidated balance sheet ; and ( 3 ) an increase in accounts receivable of $ 22.4 million . other commitments 2014revolving credit facility on october 20 , 2006 , we entered into a five-year , $ 300.0 million senior unsecured revolving credit facility providing for loans to synopsys and certain of its foreign subsidiaries . the facility replaces our previous $ 250.0 million senior unsecured credit facility , which was terminated effective october 20 , 2006 . the amount of the facility may be increased by up to an additional $ 150.0 million through the fourth year of the facility . the facility contains financial covenants requiring us to maintain a minimum leverage ratio and specified levels of cash , as well as other non-financial covenants . the facility terminates on october 20 , 2011 . borrowings under the facility bear interest at the greater of the administrative agent 2019s prime rate or the federal funds rate plus 0.50% ( 0.50 % ) ; however , we have the option to pay interest based on the outstanding amount at eurodollar rates plus a spread between 0.50% ( 0.50 % ) and 0.70% ( 0.70 % ) based on a pricing grid tied to a financial covenant . in addition , commitment fees are payable on the facility at rates between 0.125% ( 0.125 % ) and 0.175% ( 0.175 % ) per year based on a pricing grid tied to a financial covenant . as of october 31 , 2006 we had no outstanding borrowings under this credit facility and were in compliance with all the covenants . we believe that our current cash , cash equivalents , short-term investments , cash generated from operations , and available credit under our credit facility will satisfy our business requirements for at least the next twelve months. .