The Chart Shows the Number of Personal Bankruptcy Filings in Three

Essay

The chart shows the number of personal bankruptcy filings in three City regions during various months of 2001 - 2002. $$\begin{array} { | l | l | l | l | } \hline & \text { Jan 01 } & \text { Jul 01 } & \text { Jan 02 } \\\hline \text { North } & 130 & 130 & 130 \\\hline \text { West } & 310 & 310 & 250 \\\hline \text { East } & 250 & 250 & 180 \\\hline\end{array}$$ ​
Write a matrix product whose computation gives the total number by which bankruptcy filings in January, 2001, exceeded filings in January, 2002.
Enter your answer in the form $A \cdot B \cdot C = D$ , where A is the $1 \times 3$ matrix, B is the $3 \times 3$ matrix, C is the $3 \times 1$ matrix, and D is the $1 \times 1$ matrix.