GreenAgri Inc. is evaluating the purchase of new agricultural machinery costing $600,000, expected to last 6 years with no residual value. The machinery will be depreciated using the straight-line method. It requires an additional working capital of $50,000, recoverable at the end of year 6. The company's required rate of return is 15%.

Cash Flows:

Year	Cash Flow
1	$120,000
2	$140,000
3	$160,000
4	$180,000
5	$200,000
6	$220,000

Requirements:

1. Calculate the Payback Period.
2. Compute the NPV.
3. Calculate the Profitability Index (PI).
4. Determine the IRR.
5. Provide a recommendation based on NPV and PI.