Projects Y and Z from Omega Corp have the following projected cash flows:

End of Year	Project Y	Project Z
0	-4000	-4000
1	1000	1500
2	1000	1500
3	2000	2000
4	3000	2500

Requirements:

Calculate the payback period for each project.

Determine the net present value at discount rates of 11%, 19%, and 27%.