Posted by: catindiaonline | October 25, 2008

CAT Quant: Percentages Basic Concepts-1

Friends, in this lesson we will learn how to answer the questions (Problem Solving, DS and DI) based on Percentages.

The main agenda of this lesson is

Every question based on the topic PERCENTAGE must be solved without using any formulae

Yes, you will agree with me once you finish this lesson and the practice questions associated with this lesson.

So let’s get into the act now…….


In fact most of you, by now, should have already mastered the basic percentage calculations.

Let us look at a basic calculation.

Let A = 30 and B =40.

By what percentage is B greater than A?

Of course all of you know this as  (\frac {B-A}{A}) 100 .

Now,most of you should have come across certain percentage based questions, especially in Data Interpretation, where the question is not as simple as the above discussed one. And I believe in such situations you are not sure of what is the numerator and the denominator of the calculation.

So as I told you earlier, our agenda of this lesson is to AVOID FORUMULAE AND GET INTO REAL LIFE SITUATION BASED CALCULTAIONS


In the word PERCENTAGE PER means ‘for every’ and CENT means ‘100’.

So PERCENTAGE means ‘for every 100’.

For example,

If a student secured 80% marks in an exam, we neither know his marks nor the maximum marks in the exam.

But If the maximum marks are scaled to 100, the marks scored by this students will be 80.(1)

Similarly If the maximum marks are scaled to 1, the marks scored by this student will be 4/5.(2)

For rest go to CAT India Online’s CATclub

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