Record the resulting dollars in the last column. Add the values in this last column to obtain your predicted salary. You can then compare this with your actual salary to see if you are paid just the right amount, too little, or too much. For example, I am an associate professor of Economics and have been in rank since 1993. We devised a model which purports to show a relationship between the salary one receives and one's productivity.
Economists believe that individuals are paid according to how productive they are.
Well, in academia, we have no means of measuring productivity. It is very difficult to measure, in some numerical sense, the impact of our teaching or the value of our research. So we end up using proxies for productivity such as rank or years of experience. These are not perfect proxies. Thus using years at TSU has to be thrown out as a proxy for productivity.