please show the working out for everything

Johnny's Lunches is considering purchasing a new, energy-efficient grill. The grill will cost $35,000 and will be depreciated straight-line over 3 years. It will be sold for scrap metal after 5 years for $8,750. The grill will have no effect on revenues but will save Johnny's $17,500 in energy expenses. The tax rate is 30%. Required: a. What are the operating cash flows in each year? b. What are the total cash flows in each year? c. Assuming the discount rate is 12%, calculate the net present value (NPV) of the cash flow stream. Should the grill be purchased