When working on a capital budgeting problem in Finance, when examining whether purchasing a new vessel is the best choice, do you factor in the selling of the old value? And if so, is this book value or market value?

Ex. The Maracas is carried on RNI's books at a book value of only $100,000 and the book value of the spare parts is $40,000. The Maracas could probably be sold now "as is," together with its extensive inventory of spare parts, for $200,000.