7.2 (The Stock class) Design a class named Stock to represent a company's stock that contains: A private string data field named symbol for the stock's symbol A private string data field named name for the stock's name. A private float data field named previousClosingPrice that stores the stock price for the previous day. |A private float data field named currentPrice that stores the stock price for the current time. A constructor that creates a stock with the specified symbol, name, previous price, and current price. A get method for returning the stock name. A get method for returning the stock symbol Get and set methods for getting/setting the stock's previous price Get and set methods for getting/setting the stock's current price. |A method named getChangePercentO that returns the percentage changed from previousClosingPrice to currentPrice. 7.4 (The Fan class) Design a class named Fan to represent a fan. The class contains: Three constants named SLOW, MEDIUM, and FAST with the values 1, 2, and 3 to denote the fan speed. | A private int data field named speed that specifies the speed of the fan. A private bool data field named on that specifies whether the fan is on (the default is False) A private float data field named radius that specifies the radius of the fan. A private string data field named color that specifies the color of the fan. The accessor and mutator methods for all four data fields. A constructor that creates a fan with the specified speed (default SLOW), radius (default 5), color (default blue), and on (default False)