Blackhorse Productions, Incorporated, used the aging of accounts receivable method to estimate that its Allowance for Doubtful Accounts should be $20,550. The account had an unadjusted credit balance of $10,400 at that time. a. The appropriate bad debt adjustment was recorded. b. Later, an account receivable for $1,400 was determined to be uncollectible and was written off. Required: For each transaction listed above, indicate the amount and direction (+ for increase or - for decrease) of effects on the financial statement accounts and on the overall accounting equation. (Enter any decreases to Assets, Liabilities, or Stockholders Equity with a minus sign.)