Question: Peter has developed new computer software to help analyse more quickly chemical traces found at crime scenes. He is permitted to treat expenditure on this as a development activity. He incurred £50,000 in his accounting year ended 31 December 2009, and a further £13,000 in his accounting year ended 31 December 2010. From 1 January 2011, the software went on sale. Peter has estimated that the development will have a useful life of three years, by the end of which competitors will have caught up with him and will have started selling rival software. At this point he would withdraw from the market and would no longer sell the software. On a straight-line basis and assuming no residual value, what is the annual amortisation expense for the years ended 31 December 2011, 2012 and 2013?