R Company registered a patent on January 1, 2015. P Company purchased the patent from R Company for $450,000 on January 1, 2020, and began to amortize the patent over its remaining legal life. In early 2021, P Company determined that the patent's economic benefits would last only until the end of 2025. What amount should P Company record for patent amortization in 2021?

A)$30,000

B)$90,000

C)$70,000

D)$84,000