I would like to know what formulas to apply to obtain these answers.

Example: You just graduated from college and had to borrow $50,000 in student debt to make it through. Your annual payment to your lender is $3,679. The term is 20 years. 1. What is the annual interest rate? 4.0% 2. How much total interest are you going to have to pay the lender over the term of the loan? $23.580 3. Suppose that your payment on your loan (which is compounding monthly) is $300 per month. What is the annual interest rate? 12 x .323 = 3.89% Example: You just graduated from college and had to borrow $50,000 in student debt to make it through. Your annual payment to your lender is $3,679. The term is 20 years. 1. What is the annual interest rate? 4.0% 2. How much total interest are you going to have to pay the lender over the term of the loan? $23.580 3. Suppose that your payment on your loan (which is compounding monthly) is $300 per month. What is the annual interest rate? 12 x .323 = 3.89%