Magento Certified Developer GuideCategory: 7. CatalogHow do custom product options influence price calculation
Manish Prakash Staff asked 5 years ago

The getFinalPrice() function in the default price model ‘catalog/product_type_price’, has the function $finalPrice = $this->_applyOptionsPrice($product, $qty, $finalPrice);

This function basically checks if custom options have any extra price and adds that to the final price.