Final answer:
The sheet metal costs $5.04 per square foot.
Step-by-step explanation:
To find the cost per square foot of the sheet metal, we can start by solving the equation given: 8.2x + 4.9x = 66, where x represents the cost per square foot. Combining like terms, we get 13.1x = 66. Dividing both sides by 13.1, we find that x = 5.04. Therefore, the sheet metal costs $5.04 per square foot.