It takes 6 slices of bread, 9 oz of cheese, and 2 oz of butter to
make three grilled-cheese sandwiches. What is the cost per sandwich
if bread (18 slices) costs $1.90, 1 lb of cheese costs $2.49, and
1/2 lb of butter costs $1.29?
a. $.78
b. $4.87
c. $2.12
d. $1.62
First, we need to calculate the cost of the ingredients per sandwich:
- Bread: $1.90 for 18 slices means each slice costs $1.90/18 = $0.11. Six slices are needed for three sandwiches, so that's 6*$0.11 = $0.66 for bread per sandwich.
- Cheese: 1 lb is 16 oz, so 9 oz is 9/16 lb. That means the cost of the cheese per sandwich is (9/16)*$2.49 = $1.40.
- Butter: 1/2 lb is 8 oz, so 2 oz is 2/8 = 1/4 of a 1/2 lb. That means the cost of the butter per sandwich is (1/4)*$1.29 = $0.32.
Therefore, the total cost of ingredients per sandwich is $0.66 + $1.40 + $0.32 = $2.38. Finally, we divide that by 3 (since three sandwiches are made with those ingredients) to get the cost per sandwich: $2.38/3 ≈ $0.79. So the answer is a. $0.78 (rounded to the nearest cent).