please answer 2a and 2b

A plece of labor-saving equipment has just come onto the market that Mitsui Electronics, Limited, could use to reduce costs in one of its plants in Japan. Relevant data relating to the equipment follow, Purchase cost of the equipment $ 432.000 Annual cost savings that will be provided by the equipment $ 90,000 Life of the equipment 12 years Required: 1a Compute the payback period for the equipment 1b. If the company requires a payback period of four years or less, would the equipment be purchased? 2a. Compute the simple rate of return on the equipment. Use straight-line depreciation based on the equipment's useful life, 2b. Would the equipment be purchased if the company's required rate of return is 14%