Prepare the Journal Entries to Record the Following Transactions for Eklund

Prepare the journal entries to record the following transactions for Eklund Company which has a calendar year end and uses the straight-line method of depreciation.
a) On September 30, 2010, the company exchanged old delivery equipment and $24,000 for new delivery equipment. The old delivery equipment was purchased on January 1, 2008, for $84,000 and was estimated to have a $12,000 salvage value at the end of its 5-year life. Depreciation on the delivery equipment has been recorded through December 31, 2009. It is estimated that the fair market value of the old delivery equipment is $36,000 on September 30, 2010.
(b) On June 30, 2010, the company exchanged old office equipment and $40,000 for new office equipment. The old office equipment originally cost $80,000 and had accumulated depreciation to the date of disposal of $35,000. It is estimated that the fair market value of the old office equipment on June 30 was $60,000. The transaction has commercial substance.