https://file.aiquickdraw.com/mathbot/file/1727393128239mjcoydq4.jpg

Let's break down the problem and solutions shown in the image to determine the correct answer.

### Problem:
- Ron charges $10 to park a car in his lot.
- He pays $50 per day to rent the parking lot.
- 40 cars park during the day.

### Question:
How much does Ron earn after expenses?

### Approach:
1. **Income**:
   - For each car, he earns $10. So, for 40 cars, the total income is:
   \[
   10 \times 40 = 400 \text{ dollars}
   \]

2. **Expenses**:
   - He pays $50 per day to rent the lot.

3. **Net earnings**:
   - The net earnings (after expenses) are:
   \[
   \text{Net earnings} = \text{Income} - \text{Expenses} = 400 - 50 = 350 \text{ dollars}
   \]

Thus, Ron earns **$350** after expenses.

### Correct Solution:
The top-left box in the image shows this calculation:
\[
f(x) = 10x - 50 \\
f(40) = 10(40) - 50 = 400 - 50 = 350
\]
This matches the correct result: **He earns $350**.

### Do you want more details or have any questions?  
Here are 5 related questions:
1. How would the result change if Ron charged $15 per car?
2. What if Ron had to pay $100 per day for the lot rental?
3. How many cars would need to park for Ron to break even?
4. What would his earnings be if only 20 cars parked?
5. How can we generalize the earnings formula for any number of cars?

#### Tip:  
Breaking down word problems step-by-step can simplify even more complex situations.

Ron charges $10 to park a car in his parking lot. He pays $50 per day to rent the lot. If 40 cars park in his lot during the day, how much does he earn after expenses?

In this example, Ron charges $10 per car to park in his lot and pays $50 daily to rent the lot. Learn how to calculate his net earnings after expenses when 40 cars park in the lot. This word problem covers basic algebraic functions and is suitable for students in grades 6-8.

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