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We can solve this problem step by step.

### Part 1: Calculating the total cost for 3 orders of fries and 5 drinks

- The cost of one order of fries is **$1.20**.
- The cost of one drink is **$0.96**.

So, the total cost for 3 orders of fries and 5 drinks is:

\[
\text{Total cost} = (3 \times 1.20) + (5 \times 0.96)
\]

Now, calculating this:

\[
(3 \times 1.20) = 3.60
\]
\[
(5 \times 0.96) = 4.80
\]
\[
\text{Total cost for 3 fries and 5 drinks} = 3.60 + 4.80 = 8.40
\]

Thus, the cost for 3 orders of fries and 5 drinks is **$8.40**.

### Part 2: Generalizing the cost for *f* orders of fries and *d* drinks

The total cost for *f* orders of fries and *d* drinks can be written as:

\[
\text{Total cost} = (f \times 1.20) + (d \times 0.96)
\]

This formula gives the total cost for any number of fries (*f*) and drinks (*d*).

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Would you like any more details, or do you have any questions?

Here are 5 related questions:
1. How would the cost change if the price of fries or drinks increased?
2. What would the cost be for 4 orders of fries and 6 drinks?
3. Can you derive a similar equation if the price of fries and drinks were both 10% higher?
4. How would you solve for the number of drinks if you knew the total cost and the number of fries ordered?
5. How can this be expressed in matrix form?

**Tip:** Always double-check your arithmetic when solving these types of problems to avoid minor mistakes!

At the fast food restaurant, an order of fries costs $1.20 and a drink costs $0.96. How much would it cost to get 3 orders of fries and 5 drinks? How much would it cost to get f orders of fries and d drinks?

Calculate the total cost for 3 orders of fries and 5 drinks at a fast food restaurant, where fries cost $1.20 and drinks cost $0.96. This problem introduces basic arithmetic and algebraic expressions, providing a general formula for calculating costs based on any number of fries and drinks.

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