$1.$ What are the NPV$,$ PI$,$ and IRR for projects? Are there any conflicts among the three methods?

$2.$ Was Ross correct in stating that the NPV$,$ PI$,$ and IRR necessarily will yield the same ranking order? Under what situations might the NPV$,$ PI$,$ and IRR methods provide different rankings?

$3.$ Are these projects comparable even though they have unequal lives? Why? Which project should be chosen?