Answer: A patent balance of $408 million.
Step-by-step explanation:
The following can be depicted from the question:
Patent Cost (2018) = $600 million
Less: Amortization for the first three years I.e 2018 - 2020. This will be:
= ($600/20) × 3 = $90 million
Balance as at 2020 = $600 - $90 = $510 million
The remaining patent life will be:
= 8 - 3 = 5 years
Then, Amortization in 2021 will be:
= $510 million / 5
= $102 million
Balance by 2021 will then be:
= $510 million - $102 million
= $408 million