table of contents notes to consolidated financial statements ( continued ) note 5 2014income taxes ( continued ) fin 48 in the first quarter of 2008 , the company adopted fin 48 .
upon adoption of fin 48 , the company 2019s cumulative effect of a change in accounting principle resulted in an increase to retained earnings of $ 11 million .
the company had historically classified interest and penalties and unrecognized tax benefits as current liabilities .
beginning with the adoption of fin 48 , the company classifies gross interest and penalties and unrecognized tax benefits that are not expected to result in payment or receipt of cash within one year as non-current liabilities in the consolidated balance sheet .
the total amount of gross unrecognized tax benefits as of the date of adoption of fin 48 was $ 475 million , of which $ 209 million , if recognized , would affect the company 2019s effective tax rate .
as of september 27 , 2008 , the total amount of gross unrecognized tax benefits was $ 506 million , of which $ 253 million , if recognized , would affect the company 2019s effective tax rate .
the company 2019s total gross unrecognized tax benefits are classified as non-current liabilities in the consolidated balance sheet .
the aggregate changes in the balance of gross unrecognized tax benefits , which excludes interest and penalties , for the fiscal year ended september 27 , 2008 , is as follows ( in millions ) : the company 2019s policy to include interest and penalties related to unrecognized tax benefits within the provision for income taxes did not change as a result of adopting fin 48 .
as of the date of adoption , the company had accrued $ 203 million for the gross interest and penalties relating to unrecognized tax benefits .
as of september 27 , 2008 , the total amount of gross interest and penalties accrued was $ 219 million , which is classified as non-current liabilities in the consolidated balance sheet .
in 2008 , the company recognized interest expense in connection with tax matters of $ 16 million .
the company is subject to taxation and files income tax returns in the u.s .
federal jurisdiction and in many state and foreign jurisdictions .
for u.s .
federal income tax purposes , all years prior to 2002 are closed .
the years 2002-2003 have been examined by the internal revenue service ( the 201cirs 201d ) and disputed issues have been taken to administrative appeals .
the irs is currently examining the 2004-2006 years .
in addition , the company is also subject to audits by state , local , and foreign tax authorities .
in major states and major foreign jurisdictions , the years subsequent to 1988 and 2000 , respectively , generally remain open and could be subject to examination by the taxing authorities .
management believes that an 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 tax in the period such resolution occurs .
although timing of the resolution and/or closure of audits is highly uncertain , the company does not believe it is reasonably possible that its unrecognized tax benefits would materially change in the next 12 months. .

Balance as of September 30, 2007
$475
Increases related to tax positions taken during a prior period
27
Decreases related to tax positions taken during a prior period
(70)
Increases related to tax positions taken during the current period
85
Decreases related to settlements with taxing authorities
—
Decreases related to expiration of statute of limitations
(11)
Balance as of September 27, 2008
$506

.

Question: Analyse this data from a financial earnings document. what percent of the total unrecognized tax benefits is increases related to tax positions taken during a prior period?
Choices:
18.74074
1
-479
20.05336
0.05336
Correct choice index: 4