title: final = P * (((1 + (r/n)) ** (n*t))) TypeError: unsupported operand type(s) for /: 'str' and 'int'
body: <p>I'm new to Python (running Python 3), have searched every where and still stuck on this. 
  I understand that I have a string but need to get it into a integer as a final answer. Below is the code I inputted to test it out. I'm stuck on the error that I get.
  This is for a compound interest calculator where the user has to input the principal, annual interest rate, how often it's compounded, and the year(s).
  I did some research and noticed that i can use ('inf') for p,n,and r as a statement saying either can be large or small numbers. Basically the user can input any number.</p>
  
  <pre><code>P = 10000
  n = 12
  r = 0.08
  
  p = int(input("Enter starting principle please. "))
  n = int(input("Enter Compound intrest rate.(daily, monthly, quarterly, half-year, yearly) "))
  r = input("Enter annual interest amount. (decimal) ")
  t = int(input("Enter the amount of years. "))
  
  final = P * (((1 + (r/n)) ** (n*t)))
  
  print ("The final amount after", p, "years is", final)
  </code></pre>
  
  <p>Error:</p>
  
  <pre><code>Enter starting principle please. 75000
  Enter Compound intrest rate.(daily, monthly, quarterly, half-year, yearly) 12
  Enter annual interest amount. (decimal) 0.03
  Enter the amount of years. 15
  Traceback (most recent call last):
    File "C:\Users\Joshua\AppData\Local\Programs\Python\Python35-32\Program Five.py", line 10, in &lt;module&gt;
      final = P * (((1 + (r/n)) ** (n*t)))
  TypeError: unsupported operand type(s) for /: 'str' and 'int'
  </code></pre>
  
  <p>This is my first time using this site, if I left out any information please let me know. I'm open to any suggestions that will help me fix this issue. </p>
  
  <pre><code>                             Edit
  </code></pre>
  
  <p>Sorry for the wait. Okay I believe I got it to work correctly going by @Rafael Cardoso recommendation of Stop and Think. Thank you for that.</p>
  
  <pre><code>P = 10000
  n = 12
  r = 0.08
  
  p = int(input("Enter starting principle please. "))
  n = int(input("Enter Compound intrest rate.(daily, monthly, quarterly, half-year, yearly) "))
  r = float(input("Enter annual interest amount. (decimal) "))
  t = int(input("Enter the amount of years. "))
  
  final = P * (((1 + (r/n)) ** (n*t)))
  
  print ("The final amount after", p, "years is", final)
  </code></pre>
  
  <p>When I run it, no errors pop up. I found out after taking a breather that the <code>('inf')</code> was causing the issue, if I leave p,n,r with whats there it works with no issues. </p>
  
  <p>Thanks again every one!</p>