Here are the cash flows for two mutually exclusive projects:

Project	C0				C1				C2				C3
A	$	30,800			+$	12,200			+$	12,200			+$	12,200
B		30,800				0				0			+	38,700

a. Given the following interest rates (0%, 2%, 4%, 6%, 8%, 10%, 12%, 14%, 16%, 18%, 20%), above what interest rates would you prefer project A to B?

b. What is the IRR of each project? (Round your answers to 2 decimal places.)

The following are the cash flows of two projects:

Year	Project A			Project B
0	$	(330	)	$	(330	)
1		160			230
2		160			230
3		160			230
4		160

If the opportunity cost of capital is 12%, what is the profitability index for each project? (Do not round intermediate calculations. Round your answers to 4 decimal places.

The following are the cash flows of two projects:

Year	Project A			Project B
0	$	(270	)	$	(270	)
1		150			170
2		150			170
3		150			170
4		150

What are the internal rates of return on projects A and B? (Enter your answers as a percent rounded to 2 decimal places.