Fatal error: Uncaught TypeError: Unsupported operand types: string - string in /home/webdes96/furnituregallery.lk/functions/functions.php:74 Stack trace: #0 /home/webdes96/furnituregallery.lk/single-product.php(15): calculateDiscount('220000', '') #1 {main} thrown in /home/webdes96/furnituregallery.lk/functions/functions.php on line 74