Gilbert Corporation had a gross income of $500,000 in tax year 1, $150,000 in salaries, $30,000 in wages, $20,000 in interest, and $60,000 in depreciation expenses for an asset purchased 3 years ago. Ajax Corporation has a gross income of $500,000 in tax year 1, and $150,000 in salaries, $90,000 in wages, and $20,000 in interest expenses. Apply the current tax rates and determine which of the following statements is correct.

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.