Three Systems Development Project Are Being Considered, A, B, and C

Three systems development project are being considered, A, B, and C. The table below shows the rated effectiveness (0-100) of four criteria and the total cost for each of the systems. Projects with a weighted effectiveness less than 80 are rejected. Compare the systems using cost-effectiveness analysis.
$$\begin{array} { | l | c | c | c | c | } \hline & & \text { System } \boldsymbol { A } & \text { System } \boldsymbol { B } & \text { System } C \\\hline \text { Criterias } & W ( \text { weight } \% ) & E & E & E \\\hline \text { Functionality } & 40 & 90 & 80 & 80 \\\hline \text { Scalability } & 10 & 70 & 80 & 75 \\\hline \text { Maintainability } & 20 & 75 & 90 & 70 \\\hline \text { Ease of use } & 30 & 70 & 85 & 95 \\\hline \text { Cost } & & \$ 2.9 \mathrm { M } & \$ 2.5 \mathrm { M } & \$ 3.0 \mathrm {~B} \\\hline\end{array}$$