Roberts agreed to purchase a stereo system from A-One Electronics for $800 to be paid on terms of $150 down and the balance, plus interest, in monthly installments. A-One Electronics retained a security interest in the stereo to insure payment. Roberts later took the set, on which he still owed 10 installments, to Keith's Electronics for repair. Roberts then left town without paying either the remainder of the balance due on the stereo or the repair bill. How will this situation be resolved?