Part exchange allowance

Bobbin runs a business altering and repairing clothes.When she started business on 1st January 20x2 she bought a Soopastitch sewing machine for $2500..She depreciates sewing machines using the straight line method at a rate of 20% p.a and she charged a full year of depreciation in the year of acquisition and none in the year of disposal. The business has now grown such that she needs a faster machine and she will upgrade to the advance Soopastitch during Dec 20x5.The Soopastitch salesman has offered her a part exchange deal as follows: PEA for old Soopastitch $750 Balance to be paid in cash for advanced Soopastitch $4850 Could you please tell me the amount to write for the below ledger entries: PEA Dr Nc assets cost account (part of cost of new asset) Cr disposals a/c (sale proceeds of old asset) Cash paid Dr NC asset cost account Cr Cash account