Answer:
The depreciation cost of the bus per unit is $ 1.4 which is purchased on January 1, 2019.
Explanation:
The depreciation cost per unit is computed as:
Depreciable asset = Cost - Salvage Value
                = $205,860 - $7,900
                = $197,960
Depreciation per unit = Depreciable asset /Useful life expected value
                  = $197,960 / 141,400
                  = $1.4
Therefore, the per unit cost is $1.4