Sunland Tech Co. Management is investing $4,951,324 in new machinery that will produce the next-generation routers. Sales to its customers will amount to $1,830,620 for the next three years and then increase to 2,516,334 for three more years. The project is expected to last 6 years, and operating costs, excluding depreciation, will be $870,000 annually. The machinery will be depreciated to a salvage value of $0 over 6 years using the straight-line method. The company's tax rate is 30%, and the cost of capital is 14.96 percent.

a. What is the payback period?

b. What it the average accounting return (ARR)?