A trade debt as at 30th June 2015 amounted to $418, 400. Allowance for doubtful debts brought forward as at 1 st July 2014 was $18, 800. The proprietor wishes that a debt of $3, 400 should be written off and the Allowance adjusted to cover 5% of debts receivables as at 30th June 2015. Calculate the expense for the year