Meerbeck Ltd purchased equipment on 1 July 2015 for $39 800 cash. Transport and installation costs of $4 200 were paid on 5 July 2015. Useful life and residual value were estimated to be 10 years and $1800 respectively. Meerbeck Ltd depreciates equipment using the straight-line method to the nearest month, and reports annually on 30 June. The company tax rate is 30%.

In June 2017, changes in technology caused the company to revise the estimated total life from 10 years to 5 years, and the residual value from $1800 to $1200. This revised estimate was made before recording the depreciation for the financial year ended 30 June 2017.

On 30 June 2017, the company adopted the revaluation model to account for equipment. An expert valuation was obtained showing that the equipment had a fair value of $30 000 at that date.

On 30 June 2018, depreciation for the year was charged and the equipments carrying amount was re-measured to its fair value of $16 000.

On 30 September 2018, the equipment was sold for $8400 cash.

Required:

Prepare general journal entries to record the transactions and events for the period 1 July 2015 to 30 September 2018.