Essilor is a spectacles brand from France and they want to calculate the total spectacles revenue of the R Line System Line up. In order to generate the spectacles revenue, initially the spectacles records are retrieved for all of the spectacles in the record file, where the records are also validated. The validated records are then used to calculate the net price. For calculating the net price, the cost price is initially calculated using the spectacles id, and materials information. From the cost price, tax withheld is calculated using the tax rate for specific spectacles id and thus the net price of every spectacles is updated. Furthermore, process sales determine the total price for any spectacles, according to the order id and spectacles id. The orders are also verified by their order id and then classified into regular orders or bulk orders. For the regular order, the regular price is calculated and the regular invoice is returned. However, for the bulk orders, a discount is retrieved, and then the discounted price is calculated from which the bulk invoice would be sent. Finally, after the total price is collected from the invoice, a checkout is printed of the total price. Draw a structured chart for the mentioned details.