On a recent trip to the convenience store, you picked up 4 gallons of milk, 5 bottles of water, and 5 snack-size bags of chips. Your total bill (before tax) was $\$ 31.80$. If a bottle of water costs twice as much as a bag of chips, and a gallon of milk costs $\$ 2.20$ more than a bottle of water, how much does each item cost?
How much does a snack-size bag of chips cost?
$\$$ (Type an integer or a decimal.)
Answer
Final Answer: The cost of a snack-size bag of chips is \(\boxed{1.00}\)
Step 1 ：Let's denote the cost of a bag of chips as x, the cost of a bottle of water as 2x (since it costs twice as much as a bag of chips), and the cost of a gallon of milk as 2x + $2.20 (since it costs $2.20 more than a bottle of water).
Step 2 ：We know that the total cost of all items is $31.80, so we can set up the following equation: \(4*(2x + 2.20) + 5*2x + 5*x = 31.80\)
Step 3 ：Solving this equation, we find that x = 1. This means that the cost of a bag of chips is $1.00.
Step 4 ：Final Answer: The cost of a snack-size bag of chips is \(\boxed{1.00}\)
