Calculating the interest rate using the present value formula can at first seem impossible. However, with a little math and some common sense, anyone can quickly calculate an investment's interest ...

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Julia Kagan is a financial/consumer journalist and former senior editor, personal finance, of Investopedia. Marguerita is a Certified Financial Planner (CFP), Chartered Retirement Planning Counselor ...

To find an investment's interest rate, substitute price, face value, and duration into a formula. For T-bills, subtract purchase price from face value, divide by face value, adjust for term. Online ...