A couple wants to save for their daughter’s college expense. The daughter will enter college 8 years from now and she will need $40,000, $41,000, $42,000 and $43,000 in actual dollars for 4 school years. Assume that these college payments will be made at the beginning of the school year. The future general inflation rate is estimated to be 6% per year and the annual inflation-free interest rate is 5%. What is the equal amount, in actual dollars, the couple must save each year until their daughter goes to college (for 8 years)?

A system is a group of interacting or interrelated elements that act according to a set of rules to form a unified whole. 
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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.