A tractor acquired at a cost of $275,000 has an estimated residual value of $39,000, has an

Question:

A tractor acquired at a cost of $275,000 has an estimated residual value of $39,000, has an estimated useful life of 40,000 hours, and was operated 2,660 hours during the year.
Determine
(a) The depreciable cost,
(b) The depreciation rate,
(c) The units-of-output depreciation for the year.