Davis Drake Traded in His Old Truck, Which Had an Adjusted

Davis Drake traded in his old truck, which had an adjusted basis of $13,800, for a new one costing $30,000. fte dealer, Ace Trucks, allowed $18,000 on the old truck and Davis gave $12,000 in cash, as well. What is Davis's basis in the new truck?

A) $13,800
B) $18,000
C) $25,800
D) $30,000
E) $31,800