lalkond Hardeare is adding a new product ine that will requre an investment of 51,476,000. Managers estimale that this investment wil have a 10-year |fe and generate ret cash inflows of 320,000 the frat year, $300,000 the second year, and $230,000 each year thereafter for elght years. Compule the paybock period. Round to one decimal place. The parbuck in years is