Laura is planning to buy five 5-1b bags of sugar, four 5-1b bags of flour, five 1-gal cartons of milk, and four 1-dozen cartons of large eggs. The prices of these items in three neighborhood supermarkets are as follows. (5-16 bag) del ten Milk Eggs Sugar Flour (1-gal (1-dozen (5-Ib bag) (5-lb bag) carton) carton) Supermarket I $3.15 $3.79 $2.99 $3.49 Supermarket II $2.99 $2.89 $2.79 $3.29 Supermarket III $3.74 $2.98 $2.89 $2.99 (a) Write a 3 x 4 matrix A to represent the prices (in dollars) of the items in the three supermarkets. A = (b) Write a 4x 1 matrix B to represent the quantities of sugar, flour, milk, and eggs that Laura plans to purchase in the three supermarkets. (c) Use matrix multiplication to find a matrix C that represents Laura's total outlay (in dollars) at each supermarket. 1 (c) Use matrix multiplication to find a matrix C that represents Laura's total outlay (in dollars) at each supermarket.