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Project A -$25 $5 $10 $17

Project B -$20 $10 $9 $6

What are the projects IRRs at each of these WACCs? (Yes, I do need IRRs; not MIRRs. I understand that WACCs don't affect the IRRs, but I don't know the answer. Please show how to determine the answer, and the answer.)

WACC = 5%, NPVs:

Project A = 3.52 million; Project B = 2.86 million

WACC = 10%, NPVs:

Project A = .57 million; Project B = 1.04 million

WACC = 15%, NPVs:

Project A = -1.91 million; Project B = -.54 Million