Thornton Freight Company owns a truck that cost $41,000. Currently, the truck's book value is $21,000, and its expected remaining useful life is four years. Thornton has the opportunity to purchase for $31,700 a replacement truck that is extremely fuel efficient. Fuel cost for the old truck is expected to be $6,800 per year more than fuel cost for the new truck. The old truck is paid for but, in spite of being in good condition, can be sold for only $15,000 Required Calculate the total relevant costs. Should Thornton replace the old truck with the new fuel-efficient model, or should it continue to use the old truck until it wears out? es Keep Old Replace With New Total relevant costi Should Thornton replace or continue the old truck? Replace the old truck