You really need to do your own calculations...It's basic math here. A lot of your posts are all similar to these. It's not difficult solving this within 5 mins. Look at GE price for the ores and nature, then look at the price for the bar. Subtracting the two prices will give you your profit/loss.
Meh, Steel Bar is the only one that makes a decent amount of profit, not really worth it overall though.