Gravina Company is planning to spend $6,000 for a machine that it will depreciate on a straight-line basis over 10 years with no salvage value. The machine will generate additional cash revenues of $1,200 a year. Gravina will incur no additional costs except for depreciation. Its income tax rate is 35%. (For parts 3 and 4 of this question use Table 1 and Table 2 Required 1. What is the payback period of the proposed investment under the assumption that the cash inflows occur evenly throughout the year? (Round your answer to 1 decimal places.) 2. What is the accounting (book) rate of return (ARR) based on the initial investment outlay? (Round your answer to 1 decimal place.) 3, what is the maximum amount that Gravina Company should invest if it desires to earn an internal rate of return (IRR) of 15%? (Round your final answer to the nearest whole dollar amount.) 4. What is the minimum annual (pretax) cash revenue required for the project to earn a 15% internal rate of return? (Round your intermediate calculations and final answer to the nearest whole dollar amount.)