{"pre_text": ["notes to consolidated financial statements ( continued ) fair value measurements the fasb issued updated authoritative guidance in may 2011 to amend fair value measurements and related disclosures ; the guidance became effective for snap-on at the beginning of its 2012 fiscal year .", "this guidance relates to a major convergence project of the fasb and the international accounting standards board to improve international financial reporting standards ( 201cifrs 201d ) and u.s .", "gaap .", "this guidance resulted in a consistent definition of fair value and common requirements for measurement of and disclosure about fair value between ifrs and u.s .", "gaap .", "the guidance also changed some fair value measurement principles and enhanced disclosure requirements related to activities in level 3 of the fair value hierarchy .", "the adoption of this updated authoritative guidance had no impact on the company 2019s consolidated financial statements .", "disclosures relating to comprehensive income the fasb issued updated authoritative guidance in june 2011 to amend the presentation of comprehensive income in financial statements .", "the fasb also issued an accounting standards update in december 2011 that indefinitely deferred certain financial statement presentation provisions contained in its original june 2011 guidance .", "the guidance , which became effective for snap-on on a retrospective basis at the beginning of its 2012 fiscal year , gives companies the option to present other comprehensive income in either a single continuous statement or in two separate but consecutive statements .", "under both alternatives , companies are required to annually present each component of comprehensive income .", "the adoption of this updated authoritative guidance impacted the presentation of the company 2019s consolidated statements of comprehensive income , but it did not change the items that must be reported in other comprehensive income or when an item of other comprehensive income must be reclassified to net income .", "note 2 : acquisitions snap-on acquired a 60% ( 60 % ) interest in snap-on asia manufacturing ( zhejiang ) co .", "ltd .", "( 201cxiaoshan 201d ) ( formerly known as wanda snap-on ( zhejiang ) co .", "ltd. ) , the company 2019s tool manufacturing operation in xiaoshan , china , in 2008 .", "snap-on acquired the remaining 40% ( 40 % ) redeemable noncontrolling interest in xiaoshan in april 2010 for a purchase price of $ 7.7 million and $ 0.1 million of transaction costs .", "note 3 : receivables trade and other accounts receivable snap-on 2019s trade and other accounts receivable primarily arise from the sale of tools , diagnostics and equipment to a broad range of industrial and commercial customers and to snap-on 2019s independent franchise van channel on a non- extended-term basis with payment terms generally ranging from 30 to 120 days .", "the components of snap-on 2019s trade and other accounts receivable as of 2012 and 2011 year end are as follows : ( amounts in millions ) 2012 2011 ."], "post_text": ["finance and contract receivables soc originates extended-term finance and contract receivables on sales of snap-on product sold through the u.s .", "franchisee and customer network and to snap-on 2019s industrial and other customers ; snap-on 2019s foreign finance subsidiaries provide similar financing internationally .", "interest income on finance and contract receivables is included in 201cfinancial services revenue 201d on the accompanying consolidated statements of earnings .", "74 snap-on incorporated ."], "table": [["( amounts in millions )", "2012", "2011"], ["trade and other accounts receivable", "$ 516.9", "$ 485.5"], ["allowances for doubtful accounts", "-19.0 ( 19.0 )", "-22.0 ( 22.0 )"], ["total trade and other accounts receivable 2013 net", "$ 497.9", "$ 463.5"]], "table_ori": [["<i>(Amounts in millions)</i>", "2012", "2011"], ["Trade and other accounts receivable", "$516.9", "$485.5"], ["Allowances for doubtful accounts", "(19.0)", "(22.0)"], ["Total trade and other accounts receivable – net", "$497.9", "$463.5"]]}

Question: what is the change in cash flow from operating activities due to the changes in accounts receivable?
Evidence:
table_1: ( amounts in millions ) the trade and other accounts receivable of 2012 is $ 516.9 ; the trade and other accounts receivable of 2011 is $ 485.5 ;
Program: subtract(485.5, 516.9)
Answer:
str_answer: -31.4
exe_answer: -31.4