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To solve this problem, we need to determine the percentage of profit Putri made by selling the doll.

Here's the breakdown:

- Purchase price (cost price): Rp 50,000
- Selling price: Rp 80,000

### Formula for Profit Percentage:
\[
\text{Profit Percentage} = \left( \frac{\text{Selling Price} - \text{Cost Price}}{\text{Cost Price}} \right) \times 100
\]

Substitute the values:
\[
\text{Profit Percentage} = \left( \frac{80,000 - 50,000}{50,000} \right) \times 100
\]
\[
\text{Profit Percentage} = \left( \frac{30,000}{50,000} \right) \times 100
\]
\[
\text{Profit Percentage} = 0.6 \times 100 = 60\%
\]

Therefore, the correct profit percentage is **60%**, which corresponds to option **D**.

Would you like more details or have any other questions?

Here are some related questions you might find helpful:
1. How do you calculate loss percentage?
2. What happens if the selling price is less than the cost price?
3. Can profit percentage exceed 100%?
4. How does the markup on cost price differ from profit margin?
5. What is the formula to calculate the selling price if the profit percentage is known?

**Tip**: Always compare the profit to the original cost price, not the selling price.

Putri membeli boneka seharga Rp. 50.000. Kemudian, boneka dijual lagi dengan harga Rp. 80.000. Berapa persen keuntungan Putri?

Learn how to calculate the profit percentage when the selling price is Rp. 80,000 and the cost price is Rp. 50,000. This problem covers key concepts in percentage calculations, including the formula for profit percentage. Suitable for students in Grades 7-9.

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