On January 1, 2018, the general ledger of Big Blast Fireworks includes the following account balances: Accounts Debit Credit Cash $ 24,300 Accounts Receivable 42,500 Inventory 42,000 Land 79,600 Allowance for Uncollectible Accounts 2,700 Accounts Payable 29,200 Notes Payable (8%, due in 3 years) 42,000 Common Stock 68,000 Retained Earnings 46,500 Totals $ 188,400 $ 188,400 The $42,000 beginning balance of inventory consists of 420 units, each costing $100. During January 2018, Big Blast Fireworks had the following inventory transactions: January 3 Purchase 1,050 units for $115,500 on account ($110 each). January 8 Purchase 1,150 units for $132,250 on account ($115 each). January 12 Purchase 1,250 units for $150,000 on account ($120 each). January 15 Return 160 of the units purchased on January 12 because of defects. January 19 Sell 3,600 units on account for $576,000. The cost of the units sold is determined using a FIFO perpetual inventory system. January 22 Receive $529,000 from customers on accounts receivable. January 24 Pay $359,000 to inventory suppliers on accounts payable. January 27 Write off accounts receivable as uncollectible, $2,100. January 31 Pay cash for salaries during January, $110,000. The following information is available on January 31, 2018. At the end of January, the company estimates that the remaining units of inventory are expected to sell in February for only $100 each. At the end of January, $5,200 of accounts receivable are past due, and the company estimates that 30% of these accounts will not be collected. Of the remaining accounts receivable, the company estimates that 5% will not be collected. Accrued interest expense on notes payable for January. Interest is expected to be paid each December 31. Accrued income taxes at the end of January are $13,500.

All i need help with is bad debt expense calculation