I dont understand this question

Computing depreciation, net book value, and gain or loss on asset sale lynch company owns and operates a delivery van that originally cost $46,400. lynch has recorded straight-line depreciation on the van for four years, calculated assuming a $5,000 expected salvage value at the end of its estimated six-year useful life. depreciation was last recorded at the end of the fourth year, at which time lynch disposes of this van. compute the net bookvalue of the van on the disposal date.

Someone knows the answer i need in the exam

This exercise illustrates that poor quality can affect schedules and costs. a manufacturing process has 130 customer orders to fill. each order requires one component part that is purchased from a supplier. however, typically, 3% of the components are identified as defective, and the components can be assumed to be independent. (a) if the manufacturer stocks 130 components, what is the probability that the 130 orders can be filled without reordering components? (b) if the manufacturer stocks 132 components, what is the probability that the 130 orders can be filled without reordering components? (c) if the manufacturer stocks 135 components, what is the probability that the 130 orders can be filled without reordering components?