### Home > CCA2 > Chapter 10 > Lesson 10.3.2 > Problem 10-170

The use of *e* provides a shortcut for calculation of continuously compounded interest. The formula for continuous compounding is *A* = *Pe ^{rt}*, where

*A*is the total amount at any time,

*P*is the original principal,

*r*is the rate of interest, and

*t*is the time period.

Use this new formula to calculate the amount Tabitha had after investing her $10,000 for one year at 3% annual interest, compounded continuously. How does this compare with her hourly compounding result of $10,304.54?

Suppose a large investment group invested 10 billion dollars at 8% annual interest. Compare the amount they would have in one year if the interest were compounded continuously with the amount they would earn if the interest were compounded daily.

For the interest compounded daily, use

Which investors might benefit from continuous compounding, rather than daily compounding?