adding decimals and american currency symbol to single view app - ios

Question

First off, I want to thank the developers and programmers on the site who have answered many of my questions in the past. It wasn't until today that I signed up at stackoverflow. The answers many of you have provided to others has helped me a lot! Thank you!
I have an app that I am working on that takes a daily rate of pay multiplies it by days worked and then by the federal tax percentage and gives the user a net income and a gross income amount.
The issue I am having is that I cannot figure out how to implement the '$" in my net & gross income textfields.
Secondly, I would like to express that I am a total NOOB at this, so I apologize that this question may render you to say "Ha, really Josh? This is coding for 9 year olds!" I copied some code from an earlier post and implanted it into mine, so it may seem off. If you can take a look at the code and tell me what I need to do, I would greatly appreciate it! Thanks!
#implementation CRPDViewController
#synthesize dailyRateTextField;
#synthesize daysWorkedTextField;
#synthesize grossIncomeTextField;
- (IBAction)calculateButtonPressed:(UIButton *)sender
{
int result = [dailyRateTextField.text intValue] * [daysWorkedTextField.text intValue];
grossIncomeTextField.text = [NSString stringWithFormat:#"%.d", result];
float taxRate = .72;
float grossPay = [self.grossIncomeTextField.text floatValue];
float netPay = grossPay * taxRate;
self.netIncomeTextField.text = [NSString stringWithFormat:#"%.f", netPay];
// alloc formatter
NSNumberFormatter *currencyStyle = [[NSNumberFormatter alloc] init];
// set options.
[currencyStyle setFormatterBehavior:NSNumberFormatterBehavior10_4];
[currencyStyle setNumberStyle:NSNumberFormatterCurrencyStyle];
NSNumber *amount = [NSNumber numberWithInteger:78000];
// get formatted string
NSString* netPay = [currencyStyle stringFromNumber:amount]
[currencyStyle release];
}
Please give explanations in laymen terms as much as possible! Thanks Again! :)
Joshua Hart

Answer 1

To set only the $ sign use:
[NSString stringWithFormat:#"$%.f", netPay];
and setting floating point to 2 decimal places try something like:
self.netIncomeTextField.text = [NSString stringWithFormat:#"$%.2f", netPay];