Question

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

Answer 1

function GetPercentageToIncreaseOrDecrease($num1, $num2) {
    return ($num2 - $num1) / $num1 * 100;
}
  
echo "The percentage to increase from 30 to 40 is: " . GetPercentageToIncreaseOrDecrease(30, 40) . "% \n";
      
echo "The percentage to increase from 20 to 35 is: " . GetPercentageToIncreaseOrDecrease(20, 35) . "% \n";
  

  
 
  
  
/*
run:
  
The percentage to increase from 30 to 40 is: 33.333333333333% 
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;
}
  
echo "The percentage to decrease from 40 to 30 is: " . GetPercentageToIncreaseOrDecrease(40, 30) . "% \n";
echo "The percentage to decrease from 35 to 20 is: " . GetPercentageToIncreaseOrDecrease(35, 20) . "% \n";


  
 
  
  
/*
run:
  
The percentage to decrease from 40 to 30 is: -25% 
The percentage to decrease from 35 to 20 is: -42.857142857143% 
  
*/

 

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