Use the following information

You are considering investing in a process that promises to save you $55 per year( Sales-costs). The process has an expected life of 4 years with an initial cost of $80. This cost is straight line depreciated over 4 years. Assume a 34% tax bracket and a discount rate of 15%

a) What is the operating cash flow in each of the four periods

b) What is the value of the tax shield in each period from the investment in the process?