The interest rate on a loan of $100,000 a year depends on the interest rate and the type of loan. Here are some common loan scenarios and the corresponding interest calculations:

1. Fixed interest rate: If the interest rate on the loan is a fixed value, for example, 5% per annum, the interest for a year would be 100,000 multiplied by 5% equals 5,000 dollars.

2. Floating interest rate: If the interest rate on the loan changes according to market conditions, such as the prime rate plus a certain floating percentage, then the interest rate for one year will change as the interest rate changes.

3. Installment Repayment: If the loan is repaid in equal installments, the same amount is repaid each month, which includes both principal and interest. In this case, the total interest will depend on the term of the loan and the interest rate, and can usually be calculated accurately using an Equal Interest Repayment Calculator.

4. Early Repayment: If the loan is repaid early within the term of the loan, there may be an early repayment fee and this may affect the calculation of the total interest. The details need to be confirmed in consultation with the lender.

Summary: To determine how much interest to pay on a loan of 100,000 a year, you need to know the interest rate and the type of loan. Depending on the situation, the interest can be calculated by fixed rate, floating rate, installment repayment or early repayment.

Extended information:

The calculation of interest on a loan also involves factors such as fluctuating interest rates, the frequency of repayment, and overdue interest rates. In practice, it is advisable to contact your financial institution for accurate interest calculation information.