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The problem asks for the second installment payment on a loan of Rp1,200,000 with an annuity payment of Rp120,500 and an interest rate of 5% every two weeks.

Here’s how to calculate the payment for the second week:

The annuity interest formula is:
\[
A = P \times i
\]
where:
- \(A\) is the interest portion of the payment,
- \(P\) is the outstanding loan balance, and
- \(i\) is the interest rate per period.

1. **First Installment**:
   - Interest on the first installment: 
     \[
     \text{Interest} = P \times 5\% = 1,200,000 \times 0.05 = 60,000
     \]
   - The remaining amount from the first annuity payment: 
     \[
     \text{Principal reduction} = 120,500 - 60,000 = 60,500
     \]
   - New loan balance after the first payment: 
     \[
     P_{\text{new}} = 1,200,000 - 60,500 = 1,139,500
     \]

2. **Second Installment**:
   - Interest on the second installment: 
     \[
     \text{Interest} = 1,139,500 \times 5\% = 56,975
     \]
   - The total second installment: 
     \[
     \text{Second Installment} = \text{Interest} + \text{Remaining Payment}
     = 56,975 + 120,500 - 60,500 = 63,525
     \]

Thus, the correct answer is **c. Rp63.525**.

Would you like further details or explanations? Here are some related questions for deeper exploration:

1. How does the annuity formula change if the interest rate is compounded monthly instead of weekly?
2. How can the outstanding loan balance be tracked over multiple payments in this type of loan?
3. What is the total interest paid over the life of the loan in this scenario?
4. How would a different interest rate affect the second installment payment?
5. What are the advantages and disadvantages of an annuity payment structure compared to other loan payment methods?

**Tip**: Always double-check that interest rates are applied to the correct outstanding principal at each step of loan repayment calculations.

Ken Edra meminjam uang di koperasi 'HARAPAN' sebesar Rp1.200.000 yang dibayar secara anuitas sebesar Rp120.500 dengan bunga 5% per dua minggu. Besar angsuran pada minggu kedua adalah...

Learn how to calculate the second-week installment payment for a Rp1,200,000 loan with a 5% interest rate and annuity payments of Rp120,500. This example uses simple interest calculations to find the total installment amount in week two.

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