I've looked around a lot and all I've found is that I'm supposed to concatenate the string becuase JS is reading the + sign as just putting them together. Not adding.
The variable I'm having the trouble with is ANSWER. costa and profita are supposed to be added together, not just put next to each other.
var costa = calculator.costa.value;
var profita = calculator.profita.value;
var yeilda = calculator.yeilda.value;
var answer = Math.abs((costa + profita) / yeilda);
calculator.ans.value = answer;
Here is the calculator: http://qualitygrainservices.com/calc.php
I hope I gave enough information for everyone to sorta know what I'm having trouble with. If not please say something so I can give you more!