NSLog(@"%f",round(12345.6789));//12346.000000
NSLog(@"%f",round(12345.6749*100)/100);//12345.670000
NSNumber *num
= [NSNumber numberWithFloat:12.1250];
NSLog(@"%@",[NSString stringWithFormat:@"%.2f",round([num floatValue]*100)/100]);//12.13