Ms. Lewis is stopping for lunch with this year's Math Relay team. Each student gets to choose what they want for lunch. Here are their orders: Francisco: cheeseburger and large Coke Chance: large Coke and cheeseburger Yessi: chicken sandwich and fries Kit: fries and chicken sandwich Carlos: chicken nuggets and large Sprite Ms. Lewis also orders lunch and gets a chicken wrap and milkshake. The menu below shows prices for the food items. If the total price was $36.50, how much did Ms. Lewis' milkshake cost?