I have asked this question a few times but i specifically need help with the exact calculation for the internal rate of return.

you have taken a job with a local manufacturing company. Your boss has asked you to analyze a potential new product, and to recommend if the company should produce and sell the product. Specifically, your boss wants you to prepare a spreadsheet that shows the free cash flows the product would generate, and shows what the products net present value and internal rate of return are and what your recommendation is (see Table 12.1 in the textbook). Marketing information Your company already has spent $100,000 to conduct market research about the demand for the product, which indicates the optimal wholesale price for the product would be $15.00 per unit, based on the prices of similar products that competitors sell. The market research also indicates that demand for the product would last for five years. At a price of $15.00 per unit, the market research suggests that sales would be 250,000 units in the first year, and unit sales would increase 8% per year over the remaining four years of the products life. Production information Your companys production manager estimates manufacturing the product would require a machine that costs $850,000, and falls in the 3-year MACRS depreciation class. The machines expected salvage value in five years is expected to be $100,000. The production manager also estimates the products variable costs, consisting of raw materials and labor, would be $12.50 per unit, and the annual fixed costs excluding depreciation would be $350,000. He states the product could be manufactured in a building your company owns, which has no other use. Financial information Your companys stock price is $41.70 per share, the last annual dividend was $2.25 per share, and market analysts who follow your companys stock expect the dividends to grow forever at a rate of 6.0% per year. The companys beta is 1.4 and Treasury bills are paying 2.7% per year. The companys bonds have a par value of $1,000, pay a coupon of 5.5% per year, semiannually, have 12 years to maturity, and are trading at $958. The companys treasurer estimates that the new product would require a $400,000 increase in net working capital. She also has told you the companys target capital structure is 60% debt and 40% equity, the companys tax rate is 25%, and she expects the stock market return over the next year will be 9.0%.