The table below lists the cost per serving, in dollars, for items on four menus that are served at an elder-care facility.

On a particular day, a dietician orders 32 meals from menu 1, 19 from menu 2, 43 from menu 3, and 38 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 0.980.23: 1.030.19 1.010.21 0.3:5 0.990.25 0.300.280.45 0.27 0.34 0.41 0.29 0.33 0.42