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 ...

Here's how to calculate the present value of a perpetual annuity that promises to pay flat or growing annual payments with helpful examples. A perpetual annuity, also called a perpetuity, promises to ...

In the world of finance, an annuity is a contract between you and a life insurance company in which you give the company a lump sum or series of payments, and in return, the insurer promises to ...

Net present value and the profitability index are helpful tools that allow investors and companies make decisions about where to allocate their money for the best return. Net present value tells us ...

The basic premise of finance is that money has time value -- a dollar in hand today is worth more than a dollar in the future. The study of finance seeks to make it possible to compare the value of a ...

Claire Boyte-White is the lead writer for NapkinFinance.com, co-author of I Am Net Worthy, and an Investopedia contributor. Claire's expertise lies in corporate finance & accounting, mutual funds, ...

Will Kenton is an expert on the economy and investing laws and regulations. He previously held senior editorial roles at Investopedia and Kapitall Wire and holds a MA in Economics from The New School ...

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 ...