A certain brand of sheets come in three sizes (full, queen, and king). Full size

Question

A certain brand of sheets come in three sizes (full, queen, and king). Full size sheets are valued at $40, queen size sheets are valued at $50, and king size sheets are valued at $60. The table below gives the inventory for three stores that carry these sheets. Which of the following products will give the total sheet inventory value for each store? (A) [40 50 60] middot [14 12 16 18 25 28 6 8 10] (B) [14 12 16 18 25 28 6 8 10] middot [40 50 60] (C) [42 71 24] middot [40 50 60] (D) [14 18 6 12 25 8 16 28 10] middot [40 50 60] (E) [40 50 60] middot [14 12 16 18 25 28 6 8 10]

Explanation / Answer

Answer is B.

As Inventory value for Save Lots is 14*40 + 18*50 + 6*60

Inventory value for Big dollar is 12*40 + 25*50 + 8*60

Inventory value for Costless is 16*40 + 28*50 + 10*60

Which can be written in matrix form like B.

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