The inventory of a drug supply company shows that the following numbers of cases of bottles of vitamins C and B₃ (niacin) are in stock: Vitamin C—25 cases of 100-mg bottles, 10 cases of 250-mg bottles, and 32 cases of 500-mg bottles; vitamin B₃—30 cases of 100-mg bottles, 18 cases of 250-mg bottles, and 40 cases of 500-mg bottles. This is represented by matrix A below. After two shipments are sent out, each of which can be represented by matrix B below, find the matrix that represents the remaining inventory.

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A || 25 10 32 30 18 40 B = 10 5 6 12 4 8