The e-commerce business has grown significantly over the past few years. mainly due to providing a better customer experience through advance booking and order cancellation options with a full refund. In this paper. the inventory control problem of a firm that offers advance booking for the product and cancellation (with a full refund) before the due delivery date is addressed. https://www.markbroyard.com/hot-deal-jolly-rancher-filled-gummies-7oz-online-hot-sale-big-sale/