JKL Inc. is planning to replace its old machinery with a new one costing $500,000. The expected annual cash flows from the new machinery are as follows:

Year	Cash Flow
1	$90,000
2	$100,000
3	$110,000
4	$120,000
5	$130,000
6	$140,000

Requirements: (a) Calculate the payback period. (b) Calculate the NPV with a discount rate of 9%. (c) Calculate the IRR. (d) Determine the profitability index. (e) Recommend whether JKL Inc. should purchase the new machinery.