How to do compound interest on a iphone calculator?

How do you do compound interest on a iphone calculator?

Here's a link for the compound interest formula:
http://qrc.depaul.edu/StudyGuide2009/Notes/Savings%20Accounts/Compound%20Interest.htm

Turn your iPhone on its side to get additional mathematical operators. Using the formula given in the link and assuming you are solving for A given P, r, n, and t, follow these steps:

1) tap the open parentheses "("
2) tap the 1 button
3) tap the + for addition
4) tap the open parentheses "("
5) tap the number for r
6) tap the ÷ for division
7) tap the number for n
8) tap the close parentheses ")"
9) tap the close parentheses ")"
10) tap the y^x key (It looks like a y with x as the exponent)
11) tap the open parentheses "("
12) tap the number for n
13) tap the x for multiplication
14) tap the number for t
15) tap the close parentheses ")"
16) tap the = key
17) tap the x for multiplication
18) tap the number for P
19) tap the = key

You can practice using the problem presented in the previous link