Identify depreciation methods used Grove Co. acquired a production machine on January 1, 2010, at a cost of $240,000. The machine is expected to have a four year useful life, with a salvage value of $40,000. The machine is capable of producing 50,000 units of product in its lifetime. Actual production was as follows: 11,000 units in 2010; 16,000 units in 2011; 14,000 units in 2012; and 9,000 units in 2013.

Following is the comparative balance sheet presentation of the net book value of the production machine at December 31 for each year of the asset’s life, using three alternative depreciation methods (items a–c):

Production Machine, Net of Accumulated Depreciation				Â
Â	Â	At December 31		Â
Depreciation	Â	Â	Â	Â
Method?	2013	2012	2011	2010
____________________	40,000	76,000	132,000	196,000
____________________	40,000	40,000	60,000	120,000
____________________	40,000	90,000	140,000	190,000

Required:

Identify the depreciation method used for each of the preceding comparative balance sheet presentations (items a–c). If a declining-balance method is used, be sure to indicate the percentage (150% or 200%).