Thank you very much for the direction! I did all of the steps you have recommended and it works when I try to add to cart any t shirt that is a 2XL or higher, however, when I try to order a t shirt that is a small, medium, large I get the following error:
Fatal error: Call to undefined method bakatus_ItemDefinition::Quantity() in /home/content/52/8601252/html/WA_eCart/bakatus_PHP.php on line 340
On a side note, when I order a XL, it is sent to the cart but the charge that shows is just $3.00. i'm pretty sure that my calculation formula is off but I'm not sure what to change to fix the problem.