The demand for the brand X is 20,000 per month. The retailer incurs a ordering cost of $1000 per order and a holding cost of 10%. The manufacturer charges $3 for each unit of brand X. Evaluate optimal lot size for the retailer.The manufacturer incurs a fixed setup cost of $500 per production lot, production cost of $4 per unitand a holding cost of 10%. What is annual fulfillment and holding cost the manufacturer. How manufacturer and retailer can increase total supply chain surplus