Cost of assets: $100,000 (Purchased and started to use on 1 January 2018)

Estimated Useful life: 4 years

Estimated Total Units of activity : 10,000 units

Estimated Salvage value: $ 12,000

Units of Production in Year 1 : 2000 units

The company is adopting straight line method for calculation of depreciation. In the year of purchase or disposal, depreciation is calculated on monthly basis.

Sold with sales proceeds on 30 Jun 2020 : $53,000

Gain on DisposaI = $_______________