Use the Data to Calculate the Schedule Performance Index for the Project

Use the data to calculate the schedule performance index for the project for the end of week 20.All amounts are in thousands of dollars. $$\begin{array} { | l | l | l | l | l | l | l | } \hline &{ \text { Duration (weeks) } } & \\\hline & 5 & 10 & 15 & 20 & 25 & \% \text { Comp } \\\hline \text { Conceptual Design } & 10 & 6 & & & & 100 \% \\\hline \text { Graphics Design } & & 12 & 6 & 4 & & 100 \% \\\hline \text { Copyright } & & & 4 & 5 & 6 & 60 \% \\\hline \text { Samples } & & & 4 & 2 & & 100 \% \\\hline \text { Tooling } & & & 6 & 9 & 4 & 50 \% \\\hline \text { Production } & & & 2 & 6 & 14 & 20 \% \\\hline \text { Total } & 10 & 18 & 22 & 26 & 24 & \\\hline \text { Cumulative } & 10 & 28 & 50 & 76 & 100 & \\\hline\end{array}$$

A) 1.14
B) 0.88
C) 0.94
D) 0.81