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Percentages — Revision Notes

XAT · Quantitative Ability & Data Interpretation

Free Percentages revision notes for XAT Quantitative Ability & Data Interpretation 2026 — key concepts, formulas, and definitions for quick revision.

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An illustration defining percentage as 'for every 100' and showing its utility in comparing numerical data, using a student's test scores as an example. It should clearly show the calculation (ratio *
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Revision Notes — Percentages

Key concepts, formulas, and definitions from Percentages for XAT Quantitative Ability & Data Interpretation preparation.

Key Topics to Revise

1

Basic Definition and Fundamentals

  • Percent literally means 'for every 100' (derived from French 'cent' meaning 100)
  • Percentage is a powerful tool for comparing numerical data and information
  • Percentage value = (Ratio value) × 100 = (Part/Whole) × 100
2

Percentage Change Calculations

  • Percentage change measures relative change between two quantities
  • Always use original value as base unless specified otherwise
  • Percentage change can be positive (increase) or negative (decrease)
3

Percentage Change Graphics (PCG) and Applications

  • PCG is a visual method for handling successive percentage changes
  • Extremely useful for Data Interpretation calculations
  • Six major applications: successive changes, product changes, inverse proportionality, A→B→A relationships, denominator effects, ratio changes
4

Advanced Calculation Techniques

  • Percentage rule: break down calculations using 100%, 50%, 10%, 1% components
  • Fraction-to-percentage conversion table for quick calculations
  • Multiplication by decimals (1.25, 0.87) as percentage operations

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Key Concepts

Percentage is obtained by multiplyingPercentage change = (Absolute change /A mental calculation method that involvesA visualization tool showing stepWhen the product of two variables

Frequently Asked Questions

What topics are covered in Percentages for XAT?
Percentages is an important chapter in XAT Quantitative Ability & Data Interpretation. It covers key concepts and formulas that are frequently tested in the exam. Key topics include: Basic Definition and Fundamentals, Percentage Change Calculations, Percentage Change Graphics (PCG) and Applications, Advanced Calculation Techniques.
How important is Percentages for XAT?
Percentages is a frequently tested chapter in XAT Quantitative Ability & Data Interpretation. Questions from this chapter appear regularly in previous year papers. There are 55 practice questions available for this chapter.
How to prepare Percentages for XAT?
Start by understanding the core concepts, then solve practice questions. Focus on formulas and their applications. Use revision notes for quick review before the exam.

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