I am having trouble with this word problem. I need to find the profit of both the San Francisco and Los Angles store. In January, the Left Coast Bookstore chain sold 700 hardcover books, 1,400 softcover books, and 2,500 plastic books in San Francisco; it sold 300 hardcover, 500 softcover, and 500 plastic books in Los Angeles. Now, hardcover books sell for $30 each, softcover books sell for $10 each, and plastic books sell for $15 each. Suppose that each hardcover book costs the stores $10, each softcover book costs $5, and each plastic book costs $10. Use matrix operations to compute the total profit at each store in January

I don't have the proper symbol for a matrix, but the numbers would look something like this.

income cost

| 700 1400 2500 | *| 30 | - | 700 1400 2500 | * | 10 |

| 300 500 500 | | 10 | | 300 500 500 | | 5 |

| 15 | | 10 |

Hope this makes some sense to you.