Prepare a product-by-value analysis for the following products, and given the position in the product life cycle (PLC), explain what the operations manager may need to do. Product Alpha has annual sales of 1,000 units and a contribution of $2,500. It is in the introductory stage. Product Bravo has annual sales of 1,500 units and a contribution of $3,000. It is in the growth stage. Product Charlie has annual sales of 3,500 units and a contribution of $1,750. It is in the decline stage.