RD Sharma Solutions for Class 7 Chapter 11 "Percentage". 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. In this chapter, we will introduce the concept of percentage and study percentage as a fraction and also a ratio. Maths constitutes topics related to per cent, percent as a fraction, per cent as a ratio, conversion of a per cent into a fraction, conversion of fraction into a per cent, conversion of ratio into per cent and vice versa, conversion of a per cent into decimal and vice versa, finding a percentage of a given number, finding how much per cent one quantity is of another quantity via illustrations.