Kansas Enterprises purchased equipment for $73,500 on January 1, 2018. The equipment is expected to have a five-year life, with a residual value of $6,300 at the end of five years.

Using the straight-line method, the book value at December 31, 2018 would be:
A.$53,760.
B.$60,060.
C.$58,800.
D.$67,200.