A manufacturer is considering $3$ project proposals for reducing the cost of its manufacturing operations A Ois the $\text{'}$do nothing' alternative$).$ Required initial investments for $A1,A2$ and $A3$ are $$420K,$$$550K$ and $$720K,$ respectively. Assuming the IRR of all investments already exceed MARR$=15\%,$ which project should be chosen?

$\backslash$table$[[$Incremental Investment,Incremental Rate of Return $(\%)],[A_1-A_0,18],[A_2-A_0,20],[A_3-A_0,25],[A_2-A_1,10],[A_3-A_1,18],[A_3-A_2,23]]$

Which project is select

Project Bo$1$ is selected $($Select one of them use capital letter $A1,A2,A3,A4,A0)$