A firm is considering an expansion project that will last three years. The project requires an immediate purchase of a new equipment that costs $900,000. The equipment will be fully depreciated using straight-line method over the next three years. The resale price of the equipment at the end of year three is estimated to be $200,000. The project will generate annual sales of $750,000 and incur annual costs (all costs except depreciation expense) of $200,000 for each of the next three years. The project requires an immediate investment of $50,000 in NWC, which will be fully recovered in year 3. The corporate tax rate is 30%.

calculate the payback period, the discounted payback period, the net present value, and the internal rate of return. Assume that the required rate of return is 15%.