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The problem describes Pak Budi purchasing a bookshelf, and involves calculating costs including the price of the bookshelf, a purchase tax of 5%, and a delivery fee of Rp50,000. The question asks which function provides a lower cost for each bookshelf price.

Here's how to approach the solution:

### Step 1: Define the Total Cost Function
Let \( x \) be the price of the bookshelf. The total cost \( C \) includes:
1. The price of the bookshelf: \( x \).
2. The purchase tax of 5%: \( 0.05x \).
3. The delivery fee: Rp50,000.

The total cost function is:
\[
C(x) = x + 0.05x + 50,000 = 1.05x + 50,000.
\]

### Step 2: Compare Functions
To find which function provides a lower cost for each bookshelf price, we need to compare two potential functions based on the description in question 3. If one function is \( C_1(x) = 1.05x + 50,000 \), we compare it with another function (if provided, or implied in context).

### Step 3: Analyze Which Cost is Lower
- Check which cost function yields a lower value for a given range of \( x \).

Would you like me to continue solving the problem based on assumed functions, or is there additional context from question 3 that you can provide for more precise analysis?

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Here are 5 questions related to this problem:
1. How do taxes affect the overall cost function in real-life scenarios?
2. What is the impact of fixed costs (like delivery fees) on varying price levels?
3. How would the cost function change if the delivery fee was variable instead of fixed?
4. How can we graphically represent the cost functions to visually compare them?
5. What methods can be used to minimize total costs in purchasing decisions?

**Tip:** Always separate fixed and variable costs when analyzing overall expenses for clearer financial insights.

Pak Budi membeli sebuah rak buku, dengan harga rak buku, pajak pembelian 5%, dan biaya angkut Rp50.000. Berdasarkan fungsi pada nomor 3, manakah dari kedua fungsi yang memberikan biaya lebih rendah untuk setiap harga rak buku?

Learn how to compare cost functions for Pak Budi's bookshelf purchase. This problem involves calculating total costs including a 5% tax and a fixed delivery fee of Rp50,000. Suitable for students in Grades 7-9.

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