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[Frankie]

here is the first view .m

// Implement viewDidLoad to do additional setup after loading the view, typically from a nib.
- (void)viewDidLoad {
    [super viewDidLoad];
	billTotal.delegate = self;
	
	pickerViewArray = [[NSMutableArray alloc] init];
	for(int i = 1; i <= 20; i ++) { 
		NSString *myString = [NSString stringWithFormat:@"%d%", i]; 
		[pickerViewArray addObject:myString];
	}
}

- (BOOL)textFieldShouldReturn:(UITextField *)textField { 
	[textField resignFirstResponder]; 
	return YES;}

#pragma mark -
#pragma mark Picker Data Source Methods
- (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)thePickerView {
	return 1; //
}

- (NSInteger)pickerView:(UIPickerView *)thePickerView numberOfRowsInComponent:(NSInteger)component { 
	return [pickerViewArray count]; 
}
#pragma mark Picker Delegate Methods
- (NSString *)pickerView:(UIPickerView *)thePickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component {
	return [pickerViewArray objectAtIndex:row];
}

- (void)pickerView:(UIPickerView *)thePickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component { 
	tipSelected = row + 1;
	tipSelected = tipSelected;
	float tipTotal = tipSelected * 3.8 / [billTotal.text floatValue]; 
	tipAmount.text = [NSString stringWithFormat:@"Tip Level: %.2f%", tipTotal];

the second view is exactly like this only the calculation is different.