A project engineer has collected information on the increment of annual net cash flow (NCF) as shown below. At an interest rate of 10% per year, calculate the Profitable Index (PI) of the cash flow and determine if the cash flow is economically worthwhile.

Year	0	1	2	3	4	5	6
NCF, $1,000 per year	0	5	7	9	11	13	20
Investment, $1,000	15	8	10	0	0	5	10

		0.89 (Not Justified)
		1.12 (Justified)
		1.35 (Justified)
		0.73 (Not Justified)