Blue Sky Catering is considering whether to retain or replace its aging delivery truck. The old truck originally cost

$$53,000$ when it was purchased nine years ago. It has a book value of $$6,000.$ According to the mechanic who

serviced the truck during its last oil change, the old truck has $3$ years of useful life left.

Blue Sky Catering wants to purchase a brand$-$new truck. The new truck costs $$67,000$ 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 $$11,000$ 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 $$2,900$ to $$2,100$ annually. The old truck can be sold for $$7,000.$

Prepare a quantitative analysis to determine whether or not to purchase the new truck.

Do not enter dollar signs or commas in the input boxes.

Use the negative sign for values that must be subtracted.

Should they retain their old truck or replace it$?$