I ve been having trouble with this question on how to calculate the bad expenses and also on how to calculate the accounts receivable turnover ad the ratio of allowance for uncollectivle accounts to accounts receivable. If please can show me the procedure. Thank you

Exercise 5-21 On January 1, 2018, the general ledger of 3D Family Fireworks includes the following account balances S 25,100 Cash Accounts Receivable Allowance for Uncollectible Accounts Supplies Notes Receivable (6%, due in 2 years) Land 14200 2.,000 3,100 26,000 77,600 Accounts Payable Common Stock 9,000 02,000 33,000 Retained Eamings Totals $146,000 $146,000 During January 2018, the following transactions occur January 2 Provide services to customers for cash, $41,100 January 6 Provide services to customers on account, $78,400 January 15 Write off accounts receivable as uncollectible,$1,600 January 20 Pay cash for salaries, $32.000 January 22 Receive cash on accounts receivable, $76,000 January 25 Pay cash on accounts payable, $6,100 January 30 Pay cash for utilities during January, $14,300 The following information is available on January 31, 2018 a. At the end of January, $5,600 of accounts receivable are past due, and the company estimates that 20% of these acounts we not be colected Othe the company estimates that 5% will not be collected. The note receivable of S26.000 is considered uly collectible and herefore is b. Supplies at the end of January total $1,000 c. Acorued interest revenue on notes receivable for January, Interest is expected to be received each December 31 d. Unpaid salaries at the end of January are $34,100