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The problem asks for a function \( f(x) \) that represents the total cost Pak Budi needs to pay, considering the price of the bookshelf, tax, and shipping fee. Let's break down the problem:

### Given Information:
1. \( x \): Price of the bookshelf.
2. **Tax**: 5% of the price of the bookshelf.
3. **Shipping fee**: Rp 50,000.

### Total cost includes:
- The price of the bookshelf \( x \).
- The tax on the bookshelf, which is \( 0.05x \) (5% of \( x \)).
- The shipping fee, which is Rp 50,000.

Thus, the total cost function \( f(x) \) is:

\[
f(x) = x + 0.05x + 50,000 = 1.05x + 50,000
\]

### Answer:
The correct option is **b.** \( f(x) = x + 0.05x + 50,000 \).

Would you like further details or clarification on this solution?

Here are some related questions you might want to explore:
1. How would the function change if the tax was increased to 10%?
2. What would be the total cost if the bookshelf's price is Rp 200,000?
3. How much is the tax alone for a bookshelf that costs Rp 300,000?
4. If Pak Budi bought two bookshelves, how would the total cost function change?
5. How does the percentage tax affect the slope of the function?

**Tip**: Always ensure you clearly understand how each component (price, tax, fees) affects the overall total in such cost functions!

Pak Budi membeli rak buku dengan harga tertentu. Hitung biaya total yang harus dibayar termasuk harga rak buku, pajak 5%, dan biaya angkut Rp50.000.

Learn how to calculate the total cost of Pak Budi's bookshelf purchase, which includes the price of the bookshelf, a 5% tax, and a shipping fee of Rp50,000. This problem covers linear function concepts and tax calculation, suitable for students in Grades 8-10.

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