Setting Percentage NumberFormat in formula cell

How do you set the NumberFormat of a cell to percentage when the cell contains a formula?

I tried the following but it the cell style is not changed:

worksheet.Range["A1"].Number = 10.92;
worksheet.Range["B1"].Number = 20.67;
worksheet.Range["C1"].Formula = "A1/B1";
worksheet.Range["C1"].NumberFormat = "0.00%";

C1 displays "0.5283018", but it should display "52.83%".

Hi Kjell,

I am afraid that I was not able to reproduce the issue. I tested the issue with your code snippets under below system configuration:

Microsoft Windows XP
Professional
Version 2002
Service Pack 2

OS language - English
Regional Options - English(United States)
Essential Studio version - 5.2.0.25

Here is the video clip your reference:

http://www.syncfusion.com/Support/user/uploads/TestVedio_f3905bfc.zip

Please take a look at the above video clip and let me know if I am missing something and also let me know if there are any configuration changes, so that I can test in that environment and sort out the cause of the issue and provide you a solution.

Thanks,
Melba