Current Attempt in Progress

On$-$Site Testing Service has received four investment proposals for consideration. Two of the proposals, X$1$ and X$2$ are mutually exclusive. The other two proposals, $Y1$ and $Y2$ are also mutually exclusive. Proposal $Y1$ is contingent on $x1,$ and $Y2$ is contingent on $x2.$ Other than these restrictions, any combination of proposals $($including null$)$ is feasible. MARR is $7\mathrm{.}00\frac{\%}{y}$ear. The expected cash flows for the proposals are shown below. A present worth analysis is to be conducted.

$\backslash$table$[[$End of Year,X$1,$X$2,$Y$1,$Y$2],[0,-$$$9,000,-$$$13,000,-$$$7,000,-$$$12,000$