For the following projects, compute NPV, IRR, Profitability index and payback. If these projects are mutually exclusive, which one(s) should be done? If they are independent, which one(s) should be undertaken?

Year	A	B	C	D
0	-1,000	-1,500	-500	-2,000
1	400	500	100	600
2	400	500	300	800
3	400	700	250	200
4	400	200	200	300
Discount rate	10%	12%	15%	8%