Trade debts receivable as at 1 April 2010 were £382,400. During the year ended 31 March 2011, sales and sales returns amounted to £859,600 and £18,400 respectively; while £659,800 was received from credit customers and £8,200 was written off as bad. An allowance for doubtful debts is maintained at 4% of debts outstanding. Calculate the expenditure written off in the year to 31 March 2011.

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a £8,200 b £6,928 c £15,128 d £22,224