How to fulfill the Condition and calculate the percentage?

Question

PHP

Good afternoon. There are two variables $a = 717.83 and $b = 701.26. I need to calculate the percentage difference between the first and second variable, relative to the $b variable.

If 717.83 subtract 701.26 = 16.57. Which is just over 2% of the number 701.26.

How can I write this condition in PHP ? If $b is subtracted
from the variable $a and the remainder is more than 3%, then the condition is fulfilled. Can it be written in one condition? Thank you in advance.

Answer 1

<?php
$a = 717.83;
$b = 701.26;
  
$percent = (($a - $b) / $b) * 100;

echo $percent;

if ($percent >3 ) {
  echo ' Percent more then 3';
} else {
  echo ' Percent less or equal then 3';
}

Test PHP code here

Answer 2

if ($a / $b > 1.03) {
    // разница больше 3%
}