At 1 August, the sales ledger control account showed a debit balance of $1800. In August, a debt of $200 was written off as irrecoverable, and $10\,000 was collected from credit customers. By 31 August, amounts owed by credit customers were $3000. What was the total credit sales in August?
- A$7200$
- B$11\,200$
- C$11\,400$
- D$11\,600$