Project P has nonnormal cash flows; that is, it has more than one change of signs in the cash flows. Without this nonnormal cash flow pattern, we would not have the multiple IRRs.
Since Project P’s NPV is negative, the project should be rejected, even though both IRRs (25% and 400%) are greater than the project’s 10% WACC. The MIRR of 5.6% also supports the decision that the project should be rejected.