The food service manager at a large hospital is concerned about maintaining reasonable food costs. The table below lists the cost per serving, in dollars, for items on four menus.

On a particular day, a dietician orders 65 meals from menu 1, 48 from menu 2, 93 from menu 3, and 57 from menu 4.
a) Write the information in the table as a 4 × 5 matrix M.
b) Write a row matrix N that represents the number of each menu ordered.
c) Find the product NM.
d) State what the entries of NM represent.

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Menu Meat Potato Vegetable Salad Dessert 1.50: 0.15 1.550.14 1.62 0.220.3 1.70 0.200.29 0.33 0.68 0.230.64 0.75 0.280.53 140.240.21: 0.240.21 4