A grocery shopper needs to buy 5 gallons of milk, 8 cartons of eggs, and 6 loaves of bread. At the first store, the price of a loaf of bread was $1.50, the price of a gallon of milk was $3.00, and the price of a carton of eggs was $2.00. At the second store, the prices of bread, milk, and eggs were $1.00, $3.50, and $1.75, respectively. Which matrix multiplication problem could be used to find the number of dollars the shopper would spend on bread, milk, and eggs at each of the two stores?