Answer:
Let the cost of each bag of potatoes be x.
Then, the total cost of 4 bags of potatoes would be 4x.
According to the problem, Serenity pays a total of $31.69.
This can be written as:
4x + 4.09 = 31.69
Subtracting 4.09 from both sides, we get:
4x = 27.60
Dividing both sides by 4, we get:
x = 6.90
Therefore, each bag of potatoes costs $6.90.
Explanation: