🛑2: PERCENTAGE l Aptitude for Campus Placements | Aptitude Playlist for Placement | Aptitude Tricks

Introduction

This tutorial is designed to help you master percentage calculations, a crucial skill for campus placements and aptitude tests. By following these steps, you'll learn various tricks to perform percentage calculations quickly and accurately, boosting your confidence and speed in exams.

Step 1: Understanding the Basics of Percentage

• A percentage is a way to express a number as a fraction of 100.
• Formula to calculate percentage:
  • Percentage = (Part / Whole) × 100
• Example: If you scored 45 out of 60 in a test, the percentage score can be calculated as:

  Percentage = (45 / 60) × 100 = 75%
  

Step 2: Quick Percentage Calculation Tricks

• Finding 10%:

  • To find 10% of any number, simply divide the number by 10.
  • Example: 10% of 250 = 250 / 10 = 25.

• Finding 5%:

  • To find 5%, first calculate 10% and then divide it by 2.
  • Example: 5% of 250 = (10% of 250) / 2 = 25 / 2 = 12.5.

• Finding 1%:

  • To find 1%, divide the number by 100.
  • Example: 1% of 250 = 250 / 100 = 2.5.

Step 3: Calculating Increases and Decreases

• Calculating Increase:

  • To calculate an increase by a certain percentage, use the formula:

  New Value = Original Value + (Original Value × Percentage / 100)
  

  • Example: Increase 200 by 15%:

  New Value = 200 + (200 × 15 / 100) = 200 + 30 = 230
  

• Calculating Decrease:

  • To calculate a decrease by a percentage, use:

  New Value = Original Value - (Original Value × Percentage / 100)
  

  • Example: Decrease 200 by 15%:

  New Value = 200 - (200 × 15 / 100) = 200 - 30 = 170
  

Step 4: Percentage Change Calculation

• To find the percentage change between two values:

Percentage Change = [(New Value - Old Value) / Old Value] × 100

• Example: If a product's price changes from 50 to 60:

Percentage Change = [(60 - 50) / 50] × 100 = (10 / 50) × 100 = 20%

Step 5: Common Pitfalls to Avoid

• Always ensure you convert your final answer into percentage format.
• Double-check your calculations, especially when working with larger numbers or multiple percentage calculations.
• Practice using different numbers to familiarize yourself with the processes.

Conclusion

Mastering percentage calculations is essential for success in aptitude tests and campus placements. By understanding the basics and applying the quick tricks and formulas outlined in this tutorial, you can enhance your speed and accuracy. Regular practice will solidify these skills, preparing you for any examination or real-world application. For further practice, explore additional resources like the playlists mentioned in the video description.