You are considering purchasing a $1,000 bond with a coupon rate of 9.5%, interest payable annually. If the current inflation rate is 4% per year, which will continue in the foreseeable future, what would be the real rate of return if you sold the bond at $1,080 after 2 years?

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.