Nick's Novelties, Inc. is considering the purchase of electronic pinball machines to place in game arcades. The machines would cost a total of $580,000, have an eight-year useful life, and have a total salvage value of $30,000. The company estimated that annual revenues and expenses associated with the machines would be as follows: Click here to view Exhibit 10-1 and Exhibit 10-2, to determine the appropriate discount factor(s) using tables. Required: 1-a. Compute the payback period. (Round your answer to 1 decimal place.)