Percentage increase or decrease

Last updated at April 16, 2024 by

Percentage increase/decrease = (Change in value)/(Original value) × 100%

 

Note: Original value is in denominator

 

Suppose I have 100 rupees. And Harshit gave me Rs 20. What is the percentage increase in money I have?

 

Original amount = Rs 100

Amount after increase = Rs (100 + 20)

     = Rs 120

 

Change in value = 120 − 100

    = 20

 

Thus,

  Percentage increase = (Change in value)/(Original amount) × 100%

     = 20/100 × 100%

                                    = 20%

 

Suppose I have 100 rupees. And, Harshit took Rs 25 from me. What is the percentage decrease?

 

Original amount = Rs 100

Amount after decrease = Rs 100 − 25

= Rs 75

 

Change in value = 100 − 75

    = 25

 

Thus,

  Percentage decreased = (Change in value)/(Original amount) × 100%

 = 25/100 × 100%

 = 25%

Go Ad-free
Davneet Singh's photo - Co-founder, Teachoo

Made by

Davneet Singh

Davneet Singh has done his B.Tech from Indian Institute of Technology, Kanpur. He has been teaching from the past 14 years. He provides courses for Maths, Science and Computer Science at Teachoo