Create a method called bookTotalCost that takes in two parameters in the following order, a double representing the cost of all the books ordered and an int representing the amount of books ordered. A 7.5% tax must be applied to the cost of the books before shipping. Lastly, shipping costs $2 for every book ordered. This method should return the total cost of ordering the books. No printing should be done inside the method and only the cost should be returned.