The image contains a set of math word problems related to interest rates and annuities, specifically dealing with compound interest, simple interest, and annuity calculations. Here's a breakdown of each question:

1. Bu Yani's Interest Rate (Simple Interest)

   • Given: Initial amount $20,000,000$ IDR, final amount after 6 months $21,200,000$ IDR.
   • Find: The percentage rate provided by Bank A.

2. Eka's Compound Interest

   • Given: Initial amount $10,000,000$ IDR, after 9 years (2011-2020) the amount becomes $80,000,000$ IDR.
   • Find: Eka's amount in 2017.

3. Imam and Rian's Compound Interest Difference

   • Given: After 12 years, Imam has $8,000,000$ IDR more than Rian, and in year 24, the difference becomes $14,000,000$ IDR.
   • Find: The initial difference between Imam and Rian's savings.

4. Loan Repayment (4th Installment)

   • Given: A loan with a 13% annual compound interest rate, second installment is $734,500$ IDR.
   • Find: The value of the 4th installment.

5. Annuity Loan

   • Given: A merchant takes a $10,000,000$ IDR loan with 6% interest to be repaid over a year with monthly annuities.
   • Find:
     • (a) The annuity amount.
     • (b) The amount of the 5th installment.
     • (c) The remaining debt at the end of the 7th month.

Would you like to solve one of these problems in detail or discuss how to approach them?

Here are 5 related questions to expand on this:

1. How is simple interest calculated, and how does it differ from compound interest?
2. What is the formula for compound interest, and how can it be used to find the amount after a certain number of years?
3. How does annuity payment differ from other types of loan repayments, and how is the annuity amount determined?
4. How do changing interest rates impact the total amount paid over time in both simple and compound interest scenarios?
5. What role does the time period (monthly, quarterly, yearly) play in calculating compound interest and annuities?

Tip: When dealing with interest problems, always clearly distinguish between simple and compound interest and identify the time periods involved (monthly, yearly) for more accurate calculations.