Answer 1

G'day Basil Uche your temp/100 is giving 0. Remove the parentheses and it kind of works...
You also need to make per a float instead of an int, easiest way is to divide by 100.0.
Try that?
{Edit: sorry yannis2707 I started answering before taking the kids to school, your answer is best!}

Answer 2

You need to use a double or float in your percentage calculations, otherwise the number will get rounded to 0.
int per = total * (temp/100.0);
(just add .0 to the 100)