How to calculate profit formula with multiple user input text in swift4 : So im traying to make a simple calculation formula , but I don't know how to add all the variables simultaneously.

I already tried this but is giving an error and is being supper inaccurate.

   var fee :Int = Int(0.866)
    var otherFee:Int = Int(0.30)
    

    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view.
        
        
    }

    @IBAction func calculateProfit(_ sender: Any) {
        let sold = Int(soldTextField.text!)!
        let paid = Int(paidTextField.text!)!
        let shipping = Int(shippingTextField.text!)!
        
        profitTotal.text = String(sold * fee - otherFee - paid - shipping )
    }
    
}

I spect that when I hit the button it will multiply ,subtract, subtract simultaneous.