How To Calculate Percentage of a TextBox Value in Asp.Net C#

Hi Developers,

I want to Calculate a TextBox value by Percentage(int,float value).

If My

1.Float:

TextBox Value=1000

Result 1000 + 5.5%

Result should be =1055

2.Int;

TextBox Value=1000

Result 1000 + 5%

Result should be =1050

I cant able To get exact answer

So please help friends for i am done this task.

Thanks with

Paul.S