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The document you've provided is a student worksheet (Lembar Kerja Peserta Didik, LKPD) for an 11th-grade class focusing on **Compound Interest (Bunga Majemuk)**. Below are the key questions and details related to the subject:

### Questions:
1. A sum of money is deposited for 4 years at an annual compound interest rate of 7%. After 4 years, the amount becomes Rp 8,000,000. What was the original deposited amount?
2. Gilang deposits Rp 2,100,000 in a bank at a 4% quarterly compound interest rate. What will be the total savings after 3 years and 9 months?
3. A principal of Rp 6,000,000 is deposited at an annual compound interest rate of 15%. What will the total amount be after 10 semesters?
4. A sum of money is deposited for 5 years at an annual compound interest rate of 7%. After 5 years, the amount becomes Rp 8,000,000. What was the original deposited amount?
5. Gilang deposits Rp 2,200,000 at a 4% quarterly compound interest rate. What will be the total savings after 3 years and 9 months?

These problems explore the relationship between time, interest rate, and final savings in the context of compound interest. 

Would you like detailed step-by-step solutions to these questions? 

### Related Questions:
1. How is the compound interest formula derived?
2. What is the difference between simple and compound interest?
3. How does the frequency of compounding (e.g., quarterly vs annually) affect the final amount?
4. What are some real-world applications of compound interest?
5. How can you calculate the original amount given the interest rate and final value?

### Tip:
For compound interest, the formula is crucial:  
\[ A = P \left(1 + \frac{r}{n}\right)^{nt} \]  
Where:
- \(A\) is the final amount.
- \(P\) is the principal.
- \(r\) is the annual interest rate.
- \(n\) is the number of times the interest is compounded per year.
- \(t\) is the time in years.

The document you've provided is a student worksheet (Lembar Kerja Peserta Didik, LKPD) for an 11th-grade class focusing on Compound Interest (Bunga Majemuk). The key questions are related to calculating the original amount of a deposit given the interest rate and time, and determining the final savings after a certain period with compound interest.

Explore compound interest problems and solutions in this 11th-grade student worksheet. Learn how to calculate the original deposit amount and final savings using the compound interest formula.

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