as a result of the transaction , we recognized a net gain of approximately $ 1.3 billion , including $ 1.2 billion recognized in 2016 .
the net gain represents the $ 2.5 billion fair value of the shares of lockheed martin common stock exchanged and retired as part of the exchange offer , plus the $ 1.8 billion one-time special cash payment , less the net book value of the is&gs business of about $ 3.0 billion at august 16 , 2016 and other adjustments of about $ 100 million .
in 2017 , we recognized an additional gain of $ 73 million , which reflects certain post-closing adjustments , including certain tax adjustments and the final determination of net working capital .
we classified the operating results of our former is&gs business as discontinued operations in our consolidated financial statements in accordance with u.s .
gaap , as the divestiture of this business represented a strategic shift that had a major effect on our operations and financial results .
however , the cash flows generated by the is&gs business have not been reclassified in our consolidated statements of cash flows as we retained this cash as part of the transaction .
the operating results , prior to the august 16 , 2016 divestiture date , of the is&gs business that have been reflected within net earnings from discontinued operations for the year ended december 31 , 2016 are as follows ( in millions ) : .

Net sales
$3,410
Cost of sales
(2,953)
Severance charges
(19)
Gross profit
438
Other income, net
16
Operating profit
454
Earnings from discontinued operations before income taxes
454
Income tax expense
(147)
Net gain on divestiture of discontinued operations
1,205
Net earnings from discontinued operations
$1,512

the operating results of the is&gs business reported as discontinued operations are different than the results previously reported for the is&gs business segment .
results reported within net earnings from discontinued operations only include costs that were directly attributable to the is&gs business and exclude certain corporate overhead costs that were previously allocated to the is&gs business .
as a result , we reclassified $ 82 million in 2016 of corporate overhead costs from the is&gs business to other unallocated , net on our consolidated statement of earnings .
additionally , we retained all assets and obligations related to the pension benefits earned by former is&gs business salaried employees through the date of divestiture .
therefore , the non-service portion of net pension costs ( e.g. , interest cost , actuarial gains and losses and expected return on plan assets ) for these plans have been reclassified from the operating results of the is&gs business segment and reported as a reduction to the fas/cas pension adjustment .
these net pension costs were $ 54 million for the year ended december 31 , 2016 .
the service portion of net pension costs related to is&gs business 2019s salaried employees that transferred to leidos were included in the operating results of the is&gs business classified as discontinued operations because such costs are no longer incurred by us .
significant severance charges related to the is&gs business were historically recorded at the lockheed martin corporate office .
these charges have been reclassified into the operating results of the is&gs business , classified as discontinued operations , and excluded from the operating results of our continuing operations .
the amount of severance charges reclassified were $ 19 million in 2016 .
financial information related to cash flows generated by the is&gs business , such as depreciation and amortization , capital expenditures , and other non-cash items , included in our consolidated statement of cash flows for the years ended december 31 , 2016 were not significant. .

Question: Analyse this data from a financial earnings document. what was the profit margin in december 2016
Choices:
0.12845
4.54
0.4434
0.00469
0.13314
Correct choice index: 4