Question

"Consider the following cash flow and compute the equivalent annual worth at i = 13.3%.
The cash flow for years 0 through 6 in dollars is:
21,000
-3,300
-3,300
-7,500
-11,400
-13,200
-21,100
The answer could be negative."

Answer 1

Year	Cash flow	PV factor @ 13.3%	PV of cash inflow
0	21000		21000
1	-3300	0.88261	-2912.621359
2	-3300	0.77900	-2570.716116
3	-7500	0.68756	-5156.696052
4	-11400	0.60685	-6918.074139
5	-13200	0.53561	-7070.080877
6	-21100	0.47274	-9974.772427
		Total	-13602.96

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Hope that helps.

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