Calculating Payback Three investment projects are presented to you as the financial manager for a small manufacturing company. The company is trying to decide between three pieces of machinery that will streamline the production process and provide cash inflows of $6,000 per year for ten years. The three pieces of machinery will have an initial cost of $42,500, $78,250, and $130,000. As an initial analysis, you want to calculate the payback period for each option and construct a cash flow model and compute the payback period for each investment project, if applicable