Oliver Co. uses the installment-sales method. When an account had a balance of $8,400, no further collections could be made and the dining room set was repossessed. At that time, it was estimated that the dining room set could be sold for $2,400 as repossessed, or for $3,000 if the company spent $300 reconditioning it. The gross profit rate on this sale was 70%. what was the gain or loss on repossession ?