You are purchasing an automobile priced at $20,000 by borrowing at 12% interest compounded monthly. The loan will be repaid in monthly installments for five years. What is the constant dollar value (value at the time of financing) of the 36th payment of this loan, if the general inflation rate is 5% compounded monthly?

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.