Show the float value in formatted String two digits after decimal in iphone

Show the float value in formatted String two digits after decimal in iphone

I have a float number in which i insert comma after thousands value it
works fine
NSNumberFormatter *formatter = [NSNumberFormatter new];
[formatter setNumberStyle:NSNumberFormatterDecimalStyle]; // this line
is important!
NSString *formatted = [formatter stringFromNumber:[NSNumber
numberWithFloat:appDelegate.C_WND_ClinInf_Average_Default]];
but it shows 1,947 but i want it to show 1,947.00 any idea how to formate
like this.
Thanks