A company operating a minicab service depreciates its vehicles over four years using the sum of the

Question:

A company operating a minicab service depreciates its vehicles over four years using the sum of the year’s digits method. Its vehicles were all acquired on 1 March 2011 for £180,000, except a minibus acquired for £60,000 on 1 April 2012. What is the depreciation charge for the year ended 31 December 2012?