Change in Estimated Useful Life On January 1, 2007, Landon Excavation Company purchased a new bulldozer for $120,000.

The equipment had an estimated useful life of 10 years and an estimated residual value of

$10,000. On January 1, 2009, Landon determined that the bulldozer would have a total useful life of only 8 years instead of 10 years with no change in residual value. Landon uses straight-line depreciation.

Compute depreciation expense on this bulldozer for 2007, 2008, and 2009.