You just purchased a pin inserting machine to relieve some bottleneck problems that have been created in manufacturing a PC board. The machine cost $56,000 and has an estimated service life of 5 years. At that time, the estimated salvage value would be $5,000. The machine is expected to operate 2,500 hours per year. The expected annual operating and maintenance cost would be $6,000. If your firm’s interest rate is 15%, what would be the machine cost per hour?

A system is a group of interacting or interrelated elements that act according to a set of rules to form a unified whole. 
An 'information system' means a discrete set of information resources organized for the collection, processing, maintenance, use, sharing, dissemination, or disposition of information.

Engineering economics, previously known as engineering economy, is a subset of economics concerned with the use and "...application of economic principles" in the analysis of engineering decisions.