Link Lines Co. incurred the following costs related to trucks and vans used in operating its delivery service:
1. Replaced a truck's suspension system with a new suspension system that allows for the delivery of heavier loads.
2. Installed a hydraulic lift to a van.
3. Repaired a flat tire on one of the vans.
4. Removed a two-way radio from one of the trucks and installed a new radio with a greater range of communication.
5. Tinted the back and side windows of one of the vans to discourage theft of contents.
6. Changed the oil and greased the joints of all the trucks and vans.
7. Installed security systems on four of the newer trucks.
Classify each of the costs as a capital expenditure or a revenue expenditure.