complicated if statement

[#1]

Hello community

I have an 'if' statement that is giving me hell, i need your help.

We have the following fields:

[Boys]

[Girls]

[#No]

[Children]

The [Children ] can have >1 [#No].

The original expression is :

((sum([Boys])-sum([Girls]))* 0.90)-avg([Boys])

Now the 'if ' statement is supposed to be something like:

If ([#No]>1,((sum([Boys])-sum([Girls]))* 0.90)-avg([Boys]),(((sum([Boys])* 0.90)-avg([Boys])))

Dimension [Children]

Some how im getting the wrong answer when [Children] has only 1 [#No]

Please help.

[#2]

Thank you Michael, It worked perfectly.