Answer:
useful life= 12 years
Step-by-step explanation:
Giving the following information:
Purchase price= $140,000
Salvage value= $20,000
Annual depreciation= $10,000
To calculate the useful life, we need to use the straight-line method formula:
Annual depreciation= (original cost - salvage value)/estimated life (years)
10,000= (140,00 - 20,000) / useful life
10,000useful life = 120,000
useful life= 120,000 / 10,000
useful life= 12 years