Answer:
$910
Step-by-step explanation:
An allowance for doubtful debts generally has a credit balance against the debit balance of accounts receivables.
In the current circumstance the balance of allowance is debit, first it need to be reciprocated for which it will be credited by the same = $120 cr.
Further, after this the balance will be 0 in the allowance account.
The closing balance shall be $790 cr.
Accordingly an entry shall be made to provide for credit of $790.
Thus, total credit in the current period in the account = $120 + $790 = $910