$1.$ Estimate the balance of the Allowance for Doubtful Accounts using percent of sales method. Assume a $$0$ existing balance in Allowance for Doubtful Accounts. Hint: Identify the percent of uncollectible for credit sales.

$2.$ Estimate the balance of the Allowance for Doubtful Accounts using percent of receivables method. Assume a $$0$ existing balance in Allowance for Doubtful Accounts. Hint: Identify the percent of uncollectible for accounts receivable.

$3.$ Estimate the balance of the Allowance for Doubtful Accounts using aging of accounts receivable. Assume a $$0$ existing balance in Allowance for Doubtful Accounts.