Since childhood, the notion of finances is important, even if simple. The starting point is to learn about percentage increases and discounts. This concept can be applied to the price of goods, among others. Correction factor The beginning of the concept of increase and discount is given by a correction factor, applied to the price or to something that is increased or decreased. Let $p$ be the percentage applied to the price of the merchandise. Thus, the correction factor $f_c$ is given by: