Let's break down Jamie's expenses:

1. Entry Fee: $5.25
2. Bottle of Water: $1.75
3. Two Bags of Chips: $0.75 each, so 2 × $0.75 = $1.50

Now, let's add up the total cost:

$5.25 + 1.75 + 1.50 = 8.50$

Jamie started with $20, so the change she should receive is:

$20.00 - 8.50 = 11.50$

Jamie should have received $11.50 in change.

Would you like any further details on this? Here are some related questions:

1. How do we calculate the total cost when there are multiple items?
2. What would happen if one of the prices was changed (e.g., if the chips were $1 each)?
3. How would we handle a situation where Jamie paid with a $50 bill instead of $20?
4. Can this problem be solved using percentages instead of subtraction?
5. How can we track expenses if Jamie buys multiple items like this regularly?

Tip: When tracking expenses, it's useful to list each item and its price to ensure you don't overlook anything!