Answer: Depreciable cost of the machine = $4,80,000
Explanation:
Machine purchasing cost = $500,000 on January 1, Year 1
Residual value of machine = $20,000
Estimated life of machine = 20 years
machine is expected to produce = 1,000,000 widgets over its life
Depreciable cost of the machine = puchasing cost of machine - Residual value of machine
= $500,000 - $20,000
= $4,80,000