how do you calculate the bad debt expenses for 2019?

Age Group Amount Estimated Percent Receivable Uncollectible Not yet due $48,000 5% 0-30 days past due $18,000 15% 21-90 days past due $10,000 40% More than 90 days past due $4,000 80% Total $80,000 The balance in the Account for Bad Debts before the recognition of the 2019 expense is $1,100. Using the data shown above calculate the bad debt expense for 2019