Investment word problems in Algebra is one of the types of problems that usually come out in the Civil Service Exam. In solving investment word problems, you should know the basic terms used. Some of these terms are principal (P) or the money invested, the rate (R) or the percent of interest, the interest (I) or the return of investment (profit), and the time or how long the money is invested. Investment is the product of the principal, the rate, and the time, and therefore, we have the formula

I = PRT.

This tutorial series discusses the different types of problems in investment and discussed the method and strategies used in solving them.

**How to Solve Investment Problems Part 1** discusses the common terminology used in investment problems. It also discusses an investment problem where the principal is invested at two different interest rates.

**How to Solve Investment Problems Part 2** is a discussion of another investment problem just like in part 1. In the problem, the principal is invested at two different interest rates and the interest in one investment is larger than the other.

**How to Solve Investment Problems Part 3** is very similar to part 2, only that the smaller interest amount is described.

**How to Solve Investment Problems Part 4** discusses an investment problem with a given interest in one investment and an unknown amount of investment at another rate to satisfy a percentage of interest for the entire investment.