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82 GUARDIAN MEDIA LIMITED AND ITS SUBSIDIARIES ANNUAL REPORT 2020 FINANCIALS 2020GUARDIAN MEDIA LIMITED AND ITS SUBSIDIARIESNOTES TO THE CONSOLIDATED FINANCIAL STATEMENTSFOR THE YEAR ENDED 31 DECEMBER 2020(Expressed in Thousands of Trinidad and Tobago Dollars, except where otherwise stated)(Continued)6. Intangible assets (continued)Impairment testing (continued)The recoverable amount of the cash generating unit was determined using the %u201cvalue in use%u201d method. These calculations use pre-tax cash-flow projections based on financial budgets approved by management. The discount rates used are pre-tax and reflect the specific risk relating to the cashgenerating unit.The carrying amounts of goodwill and licences with indefinite useful lives are allocated to the following CGUs, for impairment testing. These CGUs are part of the %u201cMulti-Media%u201d reporting segment disclosed in Note 20.TBC Network SKY 99.5FM SLAM 100.5FM Total2020 2019 2020 2019 2020 2019 2020 2019$ $ $ $ $ $ $ $Goodwill 3,374 3,374 %u2013 %u2013 %u2013 %u2013 3,374 3,374Radio broadcast licenses %u2013 %u2013 5,800 5,800 6,099 6,099 11,899 11,899The recoverable amounts used in the impairment testing of the TBC Network, SKY 99.5FM and SLAM 100.5 FM CGUs were $43.7 million, $14.1 million and $26.4 million respectively.Key assumptions used in value in use calculations and sensitivity to changes in assumptionsThe calculation of value in use for the TBC Network, SKY 99.5FM and SLAM 100.5FM units is most sensitive to the following assumptions:%u2022 Gross margin%u2022 Discount rates%u2022 Growth rates used to extrapolate cash flows beyond the forecast period.