On January 1, 2004, Carnival Shipping bought a machine for $1,500,000. At that time,
this machine had an estimated useful life of six years, with no salvage value. As a result of
additional information, Carnival determined on January 1, 2007, that the machine had an
estimated useful life of eight years from the date it was acquired, with no salvage value.
Accordingly, the appropriate accounting change was made in 2007. How much depreciation
expense for this machine should Carnival record for the year ended December 31, 2007,
assuming Carnival uses the straight-line method of depreciation?
I'm thinking next:
1500000/8=187500
Am I right? Because I also see next
1500000/6=250000

On Jan 1, 2007 you will use the reamining book value of the asset divided by 5 years because you have already recorded Depreciation for 3 years out of the 8 years of useful life.

Your Remaining book value should be $750,000 / 5yrs = $150,000 Depreciation Expense per year.