Answer:
Option (d) is correct.
Explanation:
Depreciation per year = (Cost - Salvage value) ÷ useful life
= (18,000 - 4000) ÷ 5
= 2,800 per year
Book value at the beginning of fourth year :
= 18,000 - (3 years × 2,800)
= 9,600
Now the estimated life is changed to 7 years. But 3 years have already passed.
So, remaining life = 4 years
Depreciation for fourth year = (9,600 - 4,000) ÷ 4
= 1,400