Chargeable Gains-Individuals

Emma purchased an antique tapestry on 1 April 2003 for £12,500. The tapestry was damaged on 1 May 2013 when it was worth £30,000. After the damage the tapestry was worth £5,000. On 1 July 2013 insurance proceeds of £30,000 were received, which were not used to restore the tapestry. Required: Calculate the chargeable gain and revised base cost in respect of the tapestry. (3 marks) I have calculated a chargeable gain of $23,750 Base cost of $6,250 Is it correct?