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86GUARDIAN MEDIA LIMITED AND ITS SUBSIDIARIESNOTES TO THE CONSOLIDATED FINANCIAL STATEMENTSFOR THE YEAR ENDED 31 DECEMBER 201517. Revenue and income from operating activities (continued)2015 2014$ $Components of other income:Rental income 1,496 1,410Interest and investment income 1,361 1,842Negative goodwill arising on acquisition of subsidiary (Note 28) 544 %u2013Other income 271 1,364Dividend income 194 123Loss on revaluation of mutual funds (1,383) (282)Unrealised (loss)/gain on revaluation of investment securities (49) 85 2,434 4,542Distribution, administrative and other operating expenses included above: 2015 2014Salaries and wages 42,502 40,423Depreciation and amortisation 4,661 3,311Directors%u2019 fees 445 593Depreciation expense charged to cost of sales for the year amounted to $8.7 million (2014: $7.4 million).Staff cost included in cost of sales amount to $42.2 million (2014: $37.7 million).18. Finance costs2015 2014$ $Interest on borrowings 420 1,319Other interest and fnance costs 403 388 823 1,707(Expressed in Thousands of Trinidad and Tobago Dollars, except where otherwise stated)(Continued)