b'STAATSOLIE MAATSCHAPPIJ SURINAME N.V.NOTES TO THE CONSOLIDATED FINANCIAL STATEMENTS FOR THE YEAR ENDED DECEMBER 31, 2018 (Continued)4.5 GOODWILL AND OTHER INTANGIBLE ASSETS Other intangible assets(X US$ 1,000) Goodwill ERPE&P Data Information Total Implementation Management systemCostAt1January2017 5,447 12,048 2,037 19,532Additions- - - -Acquisitionofasubsidiary - - - -At 31 December 20175,447 12,048 2,037 19,532 Additions- - - -Acquisitionofasubsidiary - - - -Discontinued operations- - - -At 31 December 20185,447 12,048 2,037 19,532 Amortization and impairmentAt1January2017 - 3,615 1,629 5,244Amortization - 2,409 408 2,817At 31 December 2017- 6,024 2,037 8,061 Amortization - 1,004 - 1,004Impairment- - - -At 31 December 2018- 7,028 2,037 9,065 Net book value At31December2018 5,447 5,020 - 10,467At31December2017 5,447 6,024 - 11,471Other intangible assetsThepost-taxweightedaveragecostofcapital(WACC)discountrateappliedtothecashflowThebalanceatDecember31,2018ofother projectionsis12.48%(2017:12.27%),andcashintangibleassetsrepresentscapitalizedcomputer flowsbeyondthefive-yearperiodareextrapolatedsoftware with regard to ERP implementation ofusinga2%(2017:2%)growthratethatistheSAPandisamortizedonastraight-linebasisover sameasthelong-termaveragefuelconsumptionaremainingperiodof5years(2017:3years). growth rate for the petroleum products sector. Impairment testing of goodwillAsaresultoftheanalysis,managementdidnotidentifyimpairmentforthisCGU.TheGOw2CGUTheGroupperformedtheannualimpairmenttest forms part of the downstream reportable segment. asatDecember31,2018. Applyingapre-taxWACCdiscountrate19.03%(2017:20.04%)tothecashflowprojectionsGoodwillacquiredthroughbusinesscombinations provides the same VIU for the CGU.withindefinitelivehasbeenallocatedtooneCGU Key assumptions used in value-in-use (GOw2).Thecarryingvalue(netassetsincluding calculations Goodwill)ofthisCGUisUS$44,847asatDecember31,2018(US$38,344asatDecember ThecalculationofVIUfortheGOw2CGUismost31,2017). sensitivetothefollowingkeyassumptions:TherecoverableamountoftheGOw2CGUGross margin ofUS$75,135asatDecember31,2018(US$69,570asatDecember31,2017)hasDiscount ratesbeendeterminedbasedonavalue-in-use(VIU)calculationusingcashflowprojectionsOil prices fromfinancialbudgetsapprovedbyseniormanagementcoveringafive-yearperiod.The Marketshareduringthebudgetperiodprojectedcashflowshavebeenupdatedtoreflect Growthrateusedtoextrapolatecashflowsthedecreaseddemandforfinishedoilproducts. beyond the budget period78 STAATSOLIE 2018 ANNUAL REPORT'