I do not know how to get the NPV & IRR. I want to purchase a new pizza oven for my restaurant but I don't know if the investment is a good one. The oven cost is $100,000 and the oven will last for 7 years with no residual value at the end of that time. I expect to generate $22,000 income for the first 3 years and $25,000 for the final 4 years. The loan for the oven will be 9% after taxes and I do not have a tax effect on the income generated.