A machine acquired for £480,000 on 1 May 2007 and depreciated at 10% per annum using the straight-line method has a market value of £600,000 on 1 May 2011. How much is the revaluation gain to be included in the Revaluation surplus account, if the machine is to be revalued on 1 May 2011?

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a £120,000 b £72,000 c £360,000 с d £312,000