Consider two mutually exclusive investment projects: $A1$ and $A2.$ Each project has

the same service life, and the present worth of each component value $($B$,$ I, and $C^{\text{'}\text{'}})$ is

computed at $10\%$ as follows:

Project $A1$:$B=$$$8000,I=$$$3500,C^{\text{'}}=$$$2000$ and

Project A$2$: $B=$$$18000,I=$$$11,000,C^{\text{'}}=$$$4000$

Which project would be the best alternative based on $\frac{?}{PI}$ index?