PHP Program to Find the Percentage of a Number

In this problem, we are given a number and a percentage value, and we have to find the percentage of the given number. In this article, we are going to learn how we can calculate the percentage of a number in PHP using different approaches.

Understanding the Formula

To find the percentage of a number, we use the formula: (Number × Percentage) / 100

Example: The percentage of 300 with respect to 40% is calculated as (300 × 40) / 100 = 120.

Direct Calculation Approach

This is the direct approach where we calculate the percentage of a number using basic multiplication and division operators ?

Syntax

$result = ($number * $percentage) / 100;

Example

<?php
   $number = 500;
   $percentage = 10;
   $result = ($number * $percentage) / 100;
   echo "The percentage value is: " . $result;
?>

The percentage value is: 50

Using Functions

In this approach, we create a reusable function that takes a number and percentage as parameters and returns the calculated result ?

<?php
   function findPercentage($num, $percent) {
      return ($num * $percent) / 100;
   }
   
   $number = 600;
   $percentage = 25;
   $result = findPercentage($number, $percentage);
   echo "The percentage value is: " . $result;
?>

The percentage value is: 150

Using Object-Oriented Approach

We can encapsulate the percentage calculation logic within a class for better organization and reusability ?

<?php
   class PercentageCalculator {
      public function calculatePercentage($num, $percent) {
         return ($num * $percent) / 100;
      }
   }
   
   $calculator = new PercentageCalculator();
   $number = 700;
   $percentage = 30;
   $result = $calculator->calculatePercentage($number, $percentage);
   echo "The percentage value is: " . $result;
?>

The percentage value is: 210

Comparison of Methods

Conclusion

All three approaches provide efficient ways to calculate percentages in PHP with O(1) time complexity. Choose the direct method for simple calculations, functions for reusability, and classes for object-oriented applications.