results of operations for 2016 include : 1 ) $ 2836 million ( $ 1829 million net-of-tax ) of impairment and related charges primarily to write down the carrying values of the entergy wholesale commodities 2019 palisades , indian point 2 , and indian point 3 plants and related assets to their fair values ; 2 ) a reduction of income tax expense , net of unrecognized tax benefits , of $ 238 million as a result of a change in the tax classification of a legal entity that owned one of the entergy wholesale commodities nuclear power plants ; income tax benefits as a result of the settlement of the 2010-2011 irs audit , including a $ 75 million tax benefit recognized by entergy louisiana related to the treatment of the vidalia purchased power agreement and a $ 54 million net benefit recognized by entergy louisiana related to the treatment of proceeds received in 2010 for the financing of hurricane gustav and hurricane ike storm costs pursuant to louisiana act 55 ; and 3 ) a reduction in expenses of $ 100 million ( $ 64 million net-of-tax ) due to the effects of recording in 2016 the final court decisions in several lawsuits against the doe related to spent nuclear fuel storage costs .
see note 14 to the financial statements for further discussion of the impairment and related charges , see note 3 to the financial statements for additional discussion of the income tax items , and see note 8 to the financial statements for discussion of the spent nuclear fuel litigation .
net revenue utility following is an analysis of the change in net revenue comparing 2017 to 2016 .
amount ( in millions ) .

Amount (In Millions)
2016 net revenue
$6,179
Retail electric price
91
Regulatory credit resulting from reduction of thefederal corporate income tax rate
56
Grand Gulf recovery
27
Louisiana Act 55 financing savings obligation
17
Volume/weather
(61)
Other
9
2017 net revenue
$6,318

the retail electric price variance is primarily due to : 2022 the implementation of formula rate plan rates effective with the first billing cycle of january 2017 at entergy arkansas and an increase in base rates effective february 24 , 2016 , each as approved by the apsc .
a significant portion of the base rate increase was related to the purchase of power block 2 of the union power station in march 2016 ; 2022 a provision recorded in 2016 related to the settlement of the waterford 3 replacement steam generator prudence review proceeding ; 2022 the implementation of the transmission cost recovery factor rider at entergy texas , effective september 2016 , and an increase in the transmission cost recovery factor rider rate , effective march 2017 , as approved by the puct ; and 2022 an increase in rates at entergy mississippi , as approved by the mpsc , effective with the first billing cycle of july 2016 .
see note 2 to the financial statements for further discussion of the rate proceedings and the waterford 3 replacement steam generator prudence review proceeding .
see note 14 to the financial statements for discussion of the union power station purchase .
entergy corporation and subsidiaries management 2019s financial discussion and analysis .

Question: Analyse this data from a financial earnings document. what is the reduction of income tax expense as a percentage of net revenue in 2016?
Choices:
0.03767
-0.03852
-5941
0.03852
2.61538
Correct choice index: 3