Welcome!!!

Please use code tags when entering code. It makes it much easier to read.

I see problems with your formulas:
Code:
sum = num1 * num2;
Console.WriteLine("The Gross Pay is : {0} ", gross);
You're printing gross but never assiging it a value. You are assigning a value to sum but not doing anything with it. Look over your formulas and see if you can fix them. Ask questions and we will answer them, but you may be able to fix it yourself now that I gave you a hint.