$($a$)$ Calculate the net present value for each project in the following table. $($MARR $=15\%)$

$($b$)$ Calculate the benefit$-$cost ratio for each project in the following table. $($MARR $=15\%)$

$\backslash$table$[[$EOY$,$A$,$B$,$C$],[0,$$$-2000,$$$-2000,$$$-2000$