Is correct to calculate values in percentage, using the total number of iterations? Trying to clarify the problem. Imagine a factory that produce soccer balls if you produce 1 ball, it will take a certain amount of game cycles. For sake of simplicity, let's say it could take between 5 and 15 cycles (depending from various conditions, like number of workers, quality of workers and so on). Once you make a certain amount of soccer balls, the process is considered done. Now, I want to display a value in percentage for costs, and a value of defective balls made. with "cost", I am trying to display how much did I spent (materials, workers wage and so on), at the moment. The number in currency is self esplicative, but I believe a percentage value could help to know if you are using too many workers, or burning too many resources, resulting in a waste of money. To calculate the percentage of defective is relatively simple, since every X amount of time, when I refresh, I can check the balls produced against the defective ones, and the result should be Total produced 100 defective percentage of defective. But for the costs, things are different so I was planning to use the number of cycles to calculate percentage for costs cycles 100 current costs percentage of costs Would this be considered correct? Since the number of cycles for a whole batch of balls may vary slightly, this may represent that when there are less cycles, it means that you spent less money, henche the percentage will be smaller.