Let matrix A represent the sales (in thousands of dollars) for the Walbash Company in 2015 in various cities, and let matrix B represent the sales (in thousands of dollars) for the same company in 2016 in the same cities.

(a) Write the matrix that represents the total sales by type and city for both years.
(b) Write the matrix that represents the change in sales by type and city from 2015 to 2016?

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Chicago Atlanta Memphis [450 A 850] Wholesale B50 280 150 Retail 400 350 Chicago Atlanta Memphis 710] Wholesale 200 Retail 375 300 410 300