Problem with mathematical expression!

I have three text fields ('AnzalungProzent', 'Anzahlung' and 'Kaufpreis'). I want the 'Anzahlung' text field to show me the equalization of the expression shown below.
And this is the Error I am getting.
Can somebody please help me. Im probably just an idiot.
Thanks alot!

You can't do math on a string. This is a typed language. You need to convert the strings to numbers, do the math, convert the result to a string, then assign that to the 3rd text field.
If the strings are integers then try:
int val1 = [Kaufpreis.text intValue];
int val2 = [AnzahlungProzent.text intValue];
int res = val1 * 100 / val2;
Anzahlung.text = [[NSNumber numberWithInt:res] stringValue];
If they are floating point values then replace all of the 'int' with 'float'.

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2) From what I remember of routers, they should have some place of configuring the peer to peer network name (workgroup) is that what they mean by "hostname" or "domain name"?
No
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