Please provide calculations for each numbers.

In part C, could you please explain how it got to ($5,000-$1,000-$4,000+$1,000+$7,000) 3-1. Coffeldt Sign Company uses the allowance method in accounting for uncollectible accounts. Past experience indicates that 4% of accounts receivable will eventually be uncollectible. Selected account balances at December 31, 2019, and December 31, 2020, appear below: 12/31/19 12/31/20 Net Credit Sales $400,000 $450,000 Accounts Receivable 150,000 200,000 Allowance for Doubtful Accounts 5,000 ? Instructions (a) Record the following events in 2020. Aug. 10 Determined that the account of Sue Lang for $1,000 is uncollectible. Sept. 12 Determined that the account of Tom Woods for $4,000 is uncollectible. Oct. 10 Received a check for $550 as payment on account from Sue Lang, whose account had previously been written off as uncollectible. She indicated the remainder of her account would be paid in November. Nov. 15 Received a check for $450 from Sue Lang as payment on her account. (b) Prepare the adjusting journal entry to record the bad debt provision for the year ended December 31, 2020. (c) What is the balance of Allowance for Doubtful Accounts at December 31, 2020? Problems 3-1 1,000 (a) Aug. 10 1,000 4,000 Sept. 12 4,000 1,000 Oct. 10 1,000 Allowance for Doubtful Accounts..... Accounts Receivable-Sue Lang.. (To write off Sue Lang account) Allowance for Doubtful Accounts..... Accounts Receivable-Tom Woods. (To write off Tom Woods account) Accounts Receivable Sue Lang....... Allowance for Doubtful Accounts.... (To reinstate Sue Lang account previously written off) Cash.. Accounts Receivable Sue Lang. (To record collection on account) Cash...... Accounts Receivable-Sue Lang. (To record collection on account) 550 550 450 Nov. 15 450 0.04 7,000 (b) Dec. 31 7,000 Bad Debt Expense [ ($200,000 4%) - $1,000)......... Allowance for Doubtful Accounts... (To record estimate of uncollectible accounts) (c) Balance of Allowance for Doubtful Accounts at December 31, 2020, is $8,000 ($5,000 - $1,000 - $4,000+ $1,000+ $7,000)