how to calculate straight line and double declining balance depreciation if equipment is puchased in early January 2007 for 154000 with a useful life of 4 years. Equipment has a salvage value of 25000

Google knows all, even how to tell you how to do your homework! Search for double declining balance deprication double declining balance depreciation - Google Search and you'll find the first result will tell you how. I'd have to guess that searching for straight line depreciation will also be very helpful. Good luck!