Final answer:
The depreciation expense for the year 2024 is $5,946.
Step-by-step explanation:
To calculate the depreciation expense for the year 2024, we first need to determine the new depreciable base of the mini computer. The depreciable base is the original cost minus the estimated residual value.
Given that the original cost is $42,550 and the new estimated residual value is $930, the new depreciable base is $42,550 - $930 = $41,620.
Since the estimate of useful life was changed to a total of 10 years, the remaining useful life as of January 1, 2024, is 10 - 3 = 7 years.
Therefore, the depreciation expense for the year 2024 is $41,620 / 7 = $5,945.71 (rounded to the nearest dollar).