Answer:
$38,000 loss
Explanation:
For calculation of entry to record the sale of the tractor first we need to determine the total depreciation and net book value on Jan 1, 2018 which is shown below:-
Total depreciation = (Tractor cost - Salvage value) × (Hours in 2016 + Hours in 2017) ÷ Hours of operation
= ($180,000 - $20,000) × (2,400 + 2,100) ÷ 10,000
= $72,000
Net book value on January 1, 2018 = Tractor cost - Total depreciation
= $180,000 - $72,000
= $108,000
Loss on sale = Sold tractor amount - Net book value on January 1, 2018
= $70,000 - $108,000
= $38,000