Answer:
94,000
Explanation:
Activity method based on output = (output produced that year / total output of the machine) x (Cost of asset - Salvage value)
( $644,000 - $28,000) / 28,000 = 22
1 = 22 x 8000 = 176,000
2= 22 x 10,000 = 220,000
3 22 x 7000 = 154,000
Book value = cost of asset - accumulated depreciation
$644,000 - (176,00 + 220,000 + 154,000)