77 Note 1 Significant accounting policies (continued) Asset category Estimated useful life Buildings 5 to 60 years Plant and equipment 3 to 20 years Vehicles 6 to 10 years Office equipment and furniture 3 to 10 years The useful lives have been determined based on technical evaluation done by the Management | experts, which are different from the useful life prescribed in Part C of Schedule II to the Companies Act, in order to reflect the actual usage of the assets. The residual values are not more than 5% of the original cost of the asset. The residual values, useful lives and method of depreciation of property, plant and equipment are reviewed annually and adjusted prospectively, if appropriate. The carrying amount of an asset is written down immediately to its recoverable amount if the carrying amount of the asset is greater than its estimated recoverable amount. Land accounted under finance lease is amortised on a straight-line basis over the primary period of lease. Assets held under finance leases are depreciated over their expected useful lives on the same basis as owned assets. However, when there is no reasonable certainty that ownership will be obtained by the end of the lease term, assets are depreciated over the shorter of the lease term or their useful lives. h) Impairment The carrying amount of assets are reviewed at each Standalone Balance Sheet date to assess if there is any indication of impairment based on internal | external factors. An impairment loss on such assessment is recognised wherever the carrying amount of an asset exceeds its recoverable amount. The recoverable amount of the assets is net selling price or value in use, whichever is higher. While assessing value in use, the estimated future cash flows are discounted to the present value by using weighted average cost of capital. A previously recognised impairment loss is further provided or reversed depending on changes in the circumstances and to the extent that carrying amount of the assets does not exceed the carrying amount that will be determined if no impairment loss had previously been recognised. i) Cash and cash equivalents Cash and cash equivalents include cash in hand, demand deposits with bank and other short-term (three months or less from the date of acquisition), highly liquid investments that are readily convertible into cash and which are subject to an insignificant risk of changes in value. j) Trade receivables Trade receivables are recognised when the right to consideration becomes unconditional. These assets are held at amortised cost, using the effective interest rate (EIR) method where applicable, less provision for impairment based on expected credit loss.
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