Answer: $400,000
Step-by-step explanation:
When calculating the amortization of a patent, we either use the legal life or the useful life depending on which is shorter which in this case is the useful life.
Annual Amortization;
= (Cost - Salvage value) / 5 years
= (8,000,000 - 0) / 5
= $1,600,000
Patent was purchased October 1. October to December is 3 months.
Depreciation for the year is therefore;
= 1,600,000 * 3/12
= $400,000