Ballard Jewellers received an invoice dated August 22 from Safeguard Security Systems for $4,906.57 with terms 2.5/10, 1/20, n/45. Ballard made payments of $1,600 on September 1, $1,700 on September 10, and $1,000 on September 30. What amount was still owed on October 1? (Round intermediate calculations and final answer to 2 decimal places.) Balance owed $