A Machine Purchased on 1 July 2016 Cost $100 000

A machine purchased on 1 July 2016 cost $100 000 and has a zero estimated salvage value.The useful life of the machine is five years.If the machine was sold on 30 September 2018,what would its net book value be?

A) $45 000
B) $50 000
C) $55 000
D) None of the answers provided