In business, many examples of the 80/20 Principle have been validated. Twenty percent of products usually account for about 80 percent of dollar sales value; so do 20 percent of customers. Twenty percent of products or customers usually also account for about 80 percent of an organization's profits.

In Society, 20 percent of criminals account for 80 percent of the value of all crime. Twenty percent of motorists cause 80 percent of accidents. Twenty percent of children attain 80 percent of educational qualifications available.

The internal combustion engine is a great tribute to the 80/20 Principle. Eighty percent of the energy is wasted in combustion and only 20 percent gets to the wheels; this 20 percent of the input generates 100 percent of the output.

For your IIT-JEE examination use your 20% properly to get 80% marks