title: how to add percent sign to string
body: <p>Sorry I'm a bit new to objective c and I can't find out how to do something as simple as include a percent sign in a string. How is this accomplished in objective c?</p>
  
  <p>Here's what I tried:</p>
  
  <pre><code> NSString *string = @"%";
      brightnessLabel.text = [NSString stringWithFormat:[@"Brightness: %.0f" stringByAppendingString:string],slider.value];
  </code></pre>
  
  <p>but the percent doesn't show up. Thanks for the help.</p>