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The problem in the image states:

**Contoh Soal 4:**
A vendor sells fried tofu balls at Rp. 500 per piece. In one day, the vendor sells 1,000 pieces. Determine the revenue function and calculate the total revenue the vendor earns over 5 days!

### Solution:

1. **Revenue function:**

   Let \( R(d) \) represent the revenue function in terms of the number of days, \( d \). The revenue in one day can be calculated as the number of pieces sold multiplied by the price per piece.

   \[
   R(d) = 1000 \times 500 \times d
   \]
   Simplifying this:
   \[
   R(d) = 500,000 \times d
   \]

   So, the revenue function is:
   \[
   R(d) = 500,000 \times d
   \]

2. **Total revenue for 5 days:**

   To calculate the total revenue over 5 days, substitute \( d = 5 \) into the revenue function:
   \[
   R(5) = 500,000 \times 5 = 2,500,000
   \]

   So, the total revenue for 5 days is **Rp. 2,500,000**.

Would you like more details or have any questions about this solution?

### Related questions:
1. How would the revenue change if the price per tofu ball increased to Rp. 600?
2. What would the total revenue be if only 800 tofu balls were sold daily instead of 1,000?
3. Can you derive a cost function if the vendor incurs costs of Rp. 200 per tofu ball sold?
4. How would the vendor’s daily profit be affected if sales decreased by 20% each day?
5. What is the average revenue per day over a week if the vendor sells an additional 200 tofu balls every day?

**Tip:** To model real-life sales, consider external factors such as fluctuating demand or pricing.

A vendor sells fried tofu balls at Rp. 500 per piece. In one day, the vendor sells 1,000 pieces. Determine the revenue function and calculate the total revenue the vendor earns over 5 days!

Learn how to calculate the revenue function and total revenue for a vendor selling fried tofu balls at Rp. 500 each over a period of 5 days. This problem involves understanding linear functions and revenue calculation. Suitable for students in Grades 7-9.

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