15.3 Mark is self-employed and makes up his accounts annually to 30 November. His accounts for the year ended 30 November 2009 show a net profit of £7,270 and his accounts for the year ended 30 November 2010 show a net profit of £3,490. His 2009-10 trading income is £8,900. Calculate the NICs payable by Mark for 2009-10.