27. mary is considering the following two projects: year cash flow a cash flow b 0 452,000 85,000 1 -58,000 -31,000 2 -85,000 -28,000 3 -85,000 0 4 0 -25,500 5 -572,000 -19,000 both projects have required return of 10% per year. what should mary decide according to the irr rule? a. accept project a but reject project b. b. accept project b but reject project a. c. accept both projects. d. reject both projects. e. cannot decide according to the irr rule because both projects have non-conventional cash flows.