hello how is it obtained

I made a simulator with HTML that calculates the lowest selling price for you to achieve $0, meaning you must sell more than that amount to make a profit, and another that calculates how much you made after entering the purchase price, the selling price, and the investment price. For your information, Binance deductions are calculated, meaning the calculation is 100% correct. For those who want the programming code, write to me in the comments, just paste it on the HTML and it will work (free to help beginners)