Answer:
$106 million
Step-by-step explanation:
 allowance for doubtful accounts
 debit credit
beg. balance 426
bad debt 85 
ending balance 405 
 106
Since you need $106 million to balance the account, that should be the amount of bad debt written off during the current year. Allowance for doubtful accounts is a contra asset account, any debit balance increases accounts receivable while a credit balance decreases it.