For the Problem Data Set Below, What Is the Northwest

Multiple Choice

For the problem data set below, what is the northwest corner allocation to the cell Source 3-Destination 3?
$$\begin{array} { | l | r | r | r | r | } \hline \text { COSTS } & \text { Dest. 1 } & { \text { Dest. 2 } } & { \text { Dest. 3 } } & { \text { Supply } } \\\hline \text { Source 1 } & 2 & 1 & 3 & 30 \\\hline \text { Source 2 }& 4 & 2 & 1 & 40 \\\hline \text { Source 3 } & 3 & 8 & 6 & 20 \\\hline \text { Demand } & 15 & 50 & 25 & 90 \backslash 90 \\\hline\end{array}$$

A) 0
B) 15
C) 20
D) 35
E) 45