RS Aggarwal Solutions for Class 8 Chapter 9 "Percentage", one per cent is one-hundredth of a whole. It can therefore be written as both a decimal and a fraction. To write a percentage as a decimal, easily divide it by 100. For example, 50% becomes 0.5, 20% becomes 0.2, 1% becomes 0.01 and so on. In mathematics, a percentage is a number or ratio expressed as a fraction of 100. It is often denoted using the per cent sign, "%", although the abbreviations "pct.", "pct" and sometimes "pc" is also used. A percentage is a dimensionless number; it has no unit of measurement. As the Chapter is about Percentage, we use Percentage to compare values, quantify changes, to calculate the amount represented by an increase or decrease and most widely used to calculate the financial aspects of everyday life.