ine sales of certain products in three cities are given in the 4 by 3 matrix below. Tablets City 1 52 City 2 City 3 68 75 Laptop Computers 46 57 74 Cell Phones 60 53 33 Personal DVR 59 73 77 The cost of the items depend if they were sold "Retail" or "Wholesale". The Retail costs were: $186 for tablets, $307 for laptops, $362 for cell phones, and $1,121 for DVRs. The Wholesale costs were: $294 for tablets, $473 for laptops, $235 for cell phones, and $1,121 for DVRs. To get the total revenue at each city for Retail and Wholesale, we would need to put the information above (on retail and wholesale costs) into a matrix that has rows and columns and multiply it by the 4 by 3 matrix on sales at each city for each item. After multiplying these two matrices, we would have a matrix that has columns. The total wholesale revenue from city 2 would be in row and column rows and