SOLUTION: The yearly depreciation for a piece of machinery was $1500 over 6 years. If the cost of the machinery was $15,000, what was its salvage value?

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is that 1,500 per year? If so, then, every year the machine depreciated by 1,500. Over six years it depreciated by six times that much, that is, 1,500*6=9,000. The salvage value is the original cost 15,000 minus depreciation 9,000, or

15,000-9,000 = 6,000