title: java.util.UnknownFormatConversionException:
body: <pre><code>  System.out.printf("%s%13s%\n", "TarrifType", "AnnualCost");
    System.out.printf("%s%d.%n", "String" 243.08);
  
      Exception in thread "main" java.util.UnknownFormatConversionException: Conversion = '
  at java.util.Formatter.checkText(Unknown Source)
  at java.util.Formatter.parse(Unknown Source)
  at java.util.Formatter.format(Unknown Source)
  at java.io.PrintStream.format(Unknown Source)
  at java.io.PrintStream.printf(Unknown Source)
  at ModelComparison.main(ModelComparison.java:12)
  </code></pre>
  
  <p>Any idea whats wrong?</p>