Question

How to calculate percentage to increase or decrease to compare two numbers in JavaScript

Answer 1

function GetPercentageToIncreaseOrDecrease(num1, num2) {
    return (num2 - num1) / num1 * 100;
}
 
console.log("The percentage to increase from 30 to 40 is: " + GetPercentageToIncreaseOrDecrease(30, 40) + "%");
console.log("The percentage to increase from 30 to 40 is: " + GetPercentageToIncreaseOrDecrease(30, 40).toFixed(2) + "%");
 
console.log("The percentage to increase from 20 to 35 is: " + GetPercentageToIncreaseOrDecrease(20, 35) + "%");
    
    
    
    
/*
run:
  
"The percentage to increase from 30 to 40 is: 33.33333333333333%"
"The percentage to increase from 30 to 40 is: 33.33%"
"The percentage to increase from 20 to 35 is: 75%"
 
*/

 

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Answer 2

function GetPercentageToIncreaseOrDecrease(num1, num2) {
    return (num2 - num1) / num1 * 100;
}
 
console.log("The percentage to decrease from 40 to 30 is: " + GetPercentageToIncreaseOrDecrease(40, 30) + "%");
 
console.log("The percentage to decrease from 35 to 20 is: " + GetPercentageToIncreaseOrDecrease(35, 20) + "%");
console.log("The percentage to decrease from 35 to 20 is: " + GetPercentageToIncreaseOrDecrease(35, 20).toFixed(2) + "%");   
    
    
    
/*
run:
  
"The percentage to decrease from 40 to 30 is: -25%"
"The percentage to decrease from 35 to 20 is: -42.857142857142854%"
"The percentage to decrease from 35 to 20 is: -42.86%"
 
*/

 

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