a program that computes the sales tax for a collection of automobiles of different types. It consists of four classes. The first class is the Automobile class, which contains the automobiles make and model, and purchase price, which is specified in whole dollars. It should have three methods: 1. A constructor that allows the make and purchase price to be initialized. 2. A method named salesTax that returns the base sales tax computed as 5% of the sales price. 3. A toString method that returns a string containing the make and model of the automobile, the sales price, and the sales tax, appropriately labeled. The Automobile class has two subclasses. 1)is Electric. It has an additional instance variable that contains its weight in pounds stored as an integer. It should have the same three methods: 1)A constructor that allows the automobiles make and model, purchase price and weight to be initialized. 2)An overridden method salesTax that returns the total sales tax. The sales tax for an electric automobile consists of the base sales tax of 5% that applies to all automobiles minus a discount. If the weight is less than 3000 pounds the discount is $200. Otherwise it is $150. 3)An overridden toString method that returns a string containing the make and model of the automobile, the sales price, sales tax and the weight, appropriately labeled. The second subclass is Hybrid. It has an additional instance variable that contains the number of miles per gallon stored as an integer. It should have the same three methods: 1)A constructor that allows the automobiles make and model, purchase price and miles per gallon to be initialized. 2)An overridden method salesTax that returns the total sales tax The sales tax for a hybrid automobile consists of the base sales tax of 5% minus a discount. If the number of miles per gallon is less than 40, the discount is $100. Otherwise there is an additional discount of $2 for every mile per gallon in excess of 40. 3)An overridden toString method that returns a string containing the make and model of the automobile, the sales price, sales tax and the number of miles per gallon, appropriately labeled. No additional public methods should be included in any of the above three classes. Finally there is a fourth class named Project2 that contains the main method. It should generate a GUI interface