Blue Sky Catering is considering whether to retain or replace its aging delivery truck. The old truck originally cost $60,000 when it was purchased nine years ago. It has a book value of $6,000. According to the mechanic who serviced the truck during its last oil change, the old truck has 4 years of useful life left. Blue Sky Catering wants to purchase a brand-new truck. The new truck costs $68,000 and has a 10-year useful life, after which it will have no salvage value. The new truck is a little larger and would accommodate larger jobs, leading to an additional $10,000 per year in contribution margin. It would also have a refrigerated section that would reduce waste by $600 each year. As the truck will be new, repairs and maintenance costs will also decrease from $2,300 to $1,400 annually. The old truck can be sold for $8,000. Prepare a quantitative analysis to determine whether or not to purchase the new truck. Should they retain their old truck or replace it?