Final answer:
To find the price of aluminum foil per inch, you divide the total cost ($1.68) by the number of inches in the roll (84), resulting in a price of $0.02 per inch.
Step-by-step explanation:
To calculate the price per inch of the aluminum foil, we first need to convert the length of the roll from feet to inches. There are 12 inches in a foot, so a 7-foot roll is 7 x 12 = 84 inches long. Next, we divide the total cost of the roll by the total number of inches to find the cost per inch.
Cost per inch = Total cost of the roll / Total number of inches
Cost per inch = $1.68 / 84 inches
Cost per inch = $0.02
Therefore, the price per inch of the aluminum foil is $0.02.