The principle of the time value of money is probably the single most important concept in financial management. One of the most frequently encountered applications involves the calculation of a future value.

The process of converting present values into future values is called. This process requires knowledge of the values of three of four time-value-of-money variables. Which of the following is not one of these variables?

The duration of the investment (N)

The present value (PV) of the amount invested

The inflation rate indicates the change in average prices

The interest rate (I) that could be earned by invested funds

All other things being equal, the numerical difference between a present and a future value corresponds to the amount of interest earned during the deposit or investment period. Each line on the following graph corresponds to an interest rate: 0%, 10%, or 20%. Identify the interest rate that corresponds with each line.

Line A:

Line B:

Line C:

Investments and loans base their interest calculations on one of two possible methods: the interest and the interest methods. Both methods apply three variables—the amount of principal, the interest rate, and the investment or deposit period—to the amount deposited or invested in order to compute the amount of interest. However, the two methods differ in their relationship between the variables.

Assume that the variables I, N, and PV represent the interest rate, investment or deposit period, and present value of the amount deposited or invested, respectively. Which equation best represents the calculation of a future value (FV) using:

Compound interest?

FV = (1 + I)NN / PV

FV = PV x (1 + I)NN

FV = PV + (PV x I x N)

Simple interest?

FV = PV - (PV x I x N)

FV = PV + (PV x I x N)

FV = PV x I x N

Identify whether the following statements about the simple and compound interest methods are true or false.

Statement	True	False
All other variables held constant, investments paying simple interest have to pay significantly higher interest rates to earn the same amount of interest as an account earning compound interest.
Everything else held constant, an account that earns compound interest will grow more quickly than an otherwise identical account that earns simple interest.
All other factors being equal, both the simple interest and the compound interest methods will accrue the same amount of earned interest by the end of the first year.

Alek is willing to invest $30,000 for eight years and is an economically rational investor. He has identified three investment alternatives (A, B, and C) that vary in their method of calculating interest and in the annual interest rate offered. Since he can only make one investment during the eight-year investment period, complete the following table and indicate whether Alek should invest in each of the investments.

Note: When calculating each investment’s future value, assume that all interest is earned annually. The final value should be rounded to the nearest whole dollar.

Investment	Interest Rate and Method	Expected Future Value	Make this investment?
A	8% simple interest
B	3% compound interest
C	5% compound interest