139 Note 1 Significant accounting policies (continued) Subsequent costs are included in the carrying amount of asset or recognised as a separate asset, as appropriate, only when it is probable that future economic benefits associated with the itemwill flow to the Group and the cost of the item can be measured reliably. Gains or losses arising on retirement or disposal of assets are recognised in the Consolidated Statement of Profit and Loss. Spare parts, stand-by equipment and servicing equipment are recognised as property, plant and equipment if they are held for use in the production or supply of goods or services, for rental to others, or for administrative purposes and are expected to be used during more than one period. Property, plant and equipment that are not ready for intended use as on the date of Consolidated Balance Sheet are disclosed as ‘capital work-in-progress’. Depreciation methods, estimated useful lives and residual value The charge in respect of periodic depreciation is derived after determining an estimate of expected useful life and the expected residual value at the end of its life of the assets. The lives are based on historical experience with similar assets as well as anticipation of future events, which may impact their lives. Depreciation is calculated on a pro-rata basis on the straight-line method from the date of acquisition | installation till the date the assets are sold or disposed of. Estimated useful lives of the assets are as follows: 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 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 property, plant and equipment, including land acquired under finance leases are depreciated over the useful life of the asset or over the shorter of the useful life of the asset and the lease term if there is no reasonable certainty that the Group will obtain ownership at the end of the lease term. 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 and their useful life. Gains and losses on disposals are determined by comparing proceeds with carrying amount. These are included in the Consolidated Statement of Profit and Loss within other income.
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