## Lecture Notes 21

These notes explain how to use Wolfram Alpha.

Go to the following website in your favorite web browser: http://www.wolframalpha.com.

In the search box you see type: *annuity interest rate*.

You will be asked to give the present value, the number of compounding periods (the number of payments) and the periodic payment (rent).

Hit enter or click on the orange equal sign to the right of one of the text boxes you introduced your data in.

You might need to scroll down the page to see the result.